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With respect to crime, poverty and homelessness, Brown argued,One thing that may occur is that disinvestment in city downtowns will alter the spatial distribution of these elements in cities — i.e. in which neighborhoods or areas of a city is crime more likely, and homelessness more visible. Urban downtowns are often policed such that these visible elements of poverty are pushed to other parts of the city where they will not interfere with commercial activities. But absent these activities, there may be less political pressure to maintain these areas. This is not to say that the overall crime rate or homelessness levels will necessarily increase, but their spatial redistribution may further alter the trajectory of commercial downtowns — and the perception of city crime in the broader public.

“The more dramatic effects on urban geography,” Brown continued,may be how this changes cities in terms of economic and racial segregation. One urban trend from the last couple of decades is young white middle- and upper-class people living in cities at higher rates than previous generations. But if these groups become less likely to live in cities, leaving a poorer, more disproportionately minority population, this will make metropolitan regions more polarized by race/class.

the damage that even the perception of rising crime can inflict on Democrats in a Nov. 27 article, “Meet the Voters Who Fueled New York’s Seismic Tilt Toward the G.O.P.”: “From Long Island to the Lower Hudson Valley, Republicans running predominantly on crime swept five of six suburban congressional seats, including three that President Biden won handily that encompass some of the nation’s most affluent, well-educated commuter towns.

In big cities like New York and San Francisco we estimate large drops in retail spending because office workers are now coming into city centers typically 2.5 rather than 5 days a week. This is reducing business activity by billions of dollars — less lunches, drinks, dinners and shopping by office workers. This will reduce city hall tax revenues.

Public transit systems are facing massive permanent shortfalls as the surge in working from home cuts their revenues but has little impact on costs (as subway systems are mostly a fixed cost. This is leading to a permanent 30 percent drop in transit revenues on the New York Subway, San Francisco Bart, etc.

These difficulties for cities will not go away anytime soon. Bloom provided data showing strong economic incentives for both corporations and their employees to continue the work-from-home revolution if their jobs allow it:

First, “Saved commute time working from home averages about 70 minutes a day, of which about 40 percent (30 minutes) goes into extra work.” Second, “Research finds hybrid working from home increases average productivity around 5 percent and this is growing.” And third, “Employees also really value hybrid working from home, at about the same as an 8 percent pay increase on average.

three other experts in real estate economics, Arpit Gupta, of N.Y.U.’s Stern School of Business, Vrinda Mittal, both of the Columbia Business School, and Van Nieuwerburgh. They anticipate disaster in their September 2022 paper, “Work From Home and the Office Real Estate Apocalypse.”

“Our research,” Gupta wrote by email,emphasizes the possibility of an ‘urban doom loop’ by which decline of work in the center business district results in less foot traffic and consumption, which adversely affects the urban core in a variety of ways (less eyes on the street, so more crime; less consumption; less commuting) thereby lowering municipal revenues, and also making it more challenging to provide public goods and services absent tax increases. These challenges will predominantly hit blue cities in the coming years.

the three authors “revalue the stock of New York City commercial office buildings taking into account pandemic-induced cash flow and discount rate effects. We find a 45 percent decline in office values in 2020 and 39 percent in the longer run, the latter representing a $453 billion value destruction.”

Extrapolating to all properties in the United States, Gupta, Mittal and Van Nieuwerburgh write, the “total decline in commercial office valuation might be around $518.71 billion in the short-run and $453.64 billion in the long-run.”

the share of real estate taxes in N.Y.C.’s budget was 53 percent in 2020, 24 percent of which comes from office and retail property taxes. Given budget balance requirements, the fiscal hole left by declining central business district office and retail tax revenues would need to be plugged by raising tax rates or cutting government spending.

Since March 2020, Manhattan has lost 200,000 households, the most of any county in the U.S. Brooklyn (-88,000) and Queens (-51,000) also appear in the bottom 10. The cities of Chicago (-75,000), San Francisco (-67,000), Los Angeles (-64,000 for the city and -136,000 for the county), Washington DC (-33,000), Seattle (-31,500), Houston (-31,000), and Boston (-25,000) make up the rest of the bottom 10.

Prior to the pandemic, these ecosystems were designed to function based on huge surges in their daytime population from commuters and tourists. The shock of the sudden loss of a big chunk of this population caused a big disruption in the ecosystem.

Just as the pandemic has caused a surge in telework, Loh wrote, “it also caused a huge surge in unsheltered homelessness because of existing flaws in America’s housing system, the end of federally-funded relief measures, a mental health care crisis, and the failure of policies of isolation and confinement to solve the pre-existing homelessness crisis.”

The upshot, Loh continued,is that both the visibility and ratio of people in crisis relative to those engaged in commerce (whether working or shopping) has changed in a lot of U.S. downtowns, which has a big impact on how being downtown ‘feels’ and thus perceptions of downtown.

The nation, Glaeser continued, isat an unusual confluence of trends which poses dangers for cities similar to those experienced in the 1970s. Event#1 is the rise of Zoom, which makes relocation easier even if it doesn’t mean that face-to-face is going away. Event#2 is a hunger to deal with past injustices, including police brutality, mass incarceration, high housing costs and limited upward mobility for the children of the poor.

Progressive mayors, according to Glaeser,have a natural hunger to deal with these problems at the local level, but if they try to right injustices by imposing costs on businesses and the rich, then those taxpayers will just leave. I certainly remember New York and Detroit in the 1960s and 1970s, where the dreams of progressive mayors like John Lindsay and Jerome Patrick Cavanagh ran into fiscal realities.

Richard Florida, a professor of economic analysis and policy at the University of Toronto, stands out as one of the most resolutely optimistic urban scholars. In his August 2022 Bloomberg column, “Why Downtown Won’t Die,”

His answer:

Great downtowns are not reducible to offices. Even if the office were to go the way of the horse-drawn carriage, the neighborhoods we refer to today as downtowns would endure. Downtowns and the cities they anchor are the most adaptive and resilient of human creations; they have survived far worse. Continual works in progress, they have been rebuilt and remade in the aftermaths of all manner of crises and catastrophes — epidemics and plagues; great fires, floods and natural disasters; wars and terrorist attacks. They’ve also adapted to great economic transformations like deindustrialization a half century ago.

Florida wrote that many urban central business districts are “relics of the past, the last gasp of the industrial age organization of knowledge work the veritable packing and stacking of knowledge workers in giant office towers, made obsolete and unnecessary by new technologies.”

“Downtowns are evolving away from centers for work to actual neighborhoods. Jane Jacobs titled her seminal 1957 essay, which led in fact to ‘The Death and Life of Great American Cities,’ ‘Downtown Is for People’ — sounds about right to me.”

Despite his optimism, Florida acknowledged in his email thatAmerican cities are uniquely vulnerable to social disorder — a consequence of our policies toward guns and lack of a social safety net. Compounding this is our longstanding educational dilemma, where urban schools generally lack the quality of suburban schools. American cities are simply much less family-friendly than cities in most other parts of the advanced world. So when people have kids they are more or less forced to move out of America’s cities.

What worries me in all of this, in addition to the impact on cities, is the impact on the American economy — on innovation. and competitiveness. Our great cities are home to the great clusters of talent and innovation that power our economy. Remote work has many advantages and even leads to improvements in some kinds of knowledge work productivity. But America’s huge lead in innovation, finances, entertainment and culture industries comes largely from its great cities. Innovation and advance in. these industries come from the clustering of talent, ideas and knowledge. If that gives out, I worry about our longer-run economic future and living standards.

The risk that comes with fiscal distress is clear: If city governments face budget shortfalls and begin to cut back on funding for public transit, policing, and street outreach, for the maintenance of parks, playgrounds, community centers, and schools, and for services for homelessness, addiction, and mental illness, then conditions in central cities will begin to deteriorate.

There is reason for both apprehension and hope. Cities across time have proven remarkably resilient and have survived infectious diseases from bubonic plague to cholera to smallpox to polio. The world population, which stands today at eight billion people, is 57 percent urban, and because of the productivity, innovation and inventiveness that stems from the creativity of human beings in groups, the urbanization process is quite likely to continue into the foreseeable future. There appears to be no alternative, so we will have to make it work.

In any case, the fear of nuclear war has been around since the time of Hiroshima, but also, there are other fears. If we don’t get climate policy right, will we all be cooked? Or will climate-induced disruptions lead to great power war, nuclear conflict? Will changing technology — the AIs — take over? Whatever, we live in a time of existential fear, and foreign policy and all kinds of national policy questions get invested with these ultimate questions.

What makes democracy work under those circumstances tends to be senses of identification with elites, with different social-political groups. The glue that holds a democratic society — the cultural glue, intellectual glue, spiritual glue — becomes much more important

In terms of mass societies and democracies and large cultural groups, it’s profoundly destabilizing. You have that problem, that existential fear, which some people respond to by denial, some people fall into extremism — lots of responses, but you can see that.

Then the other thing is that, in a large democratic society like ours — 300-plus million people — if political power was divided equally among all 300 million Americans, it would mean that no one had any power.

Politics is less about, if we raise the sales tax half a percent, is that a good thing or a bad thing on balance? It’s more about, can we save the planet? Can we save human civilization? When people face those kinds of questions without some kind of grounding in some kind of religion, faith, it’s actually . . . There are individual people who can keep their psychological balance in the face of that. There are not many.

The American political-studies belief since World War II has essentially been, democracy is the only stable form of government. Everywhere democracy is inexorably rising, and every other form of government is incredibly unstable. This bears very, very little relationship to the facts outside of Western Europe, let’s say the world of NATO plus Japan and Australia.

to do foreign policy well

Which American president has best understood the Middle East, and then worst? MEAD: Interesting. Nobody’s gotten it totally. I’d say George H.W. Bush and Richard Nixon probably are the two, in my mind, who best understood what they were dealing with.

COWEN: What is it they had that maybe the others didn’t? MEAD: What they saw in the Middle East is that America has both hard-power goals and what you could call soft-power, idealistic goals in the Middle East, that our hard-power goals are vital, and they are achievable. Our soft-power goals are important but largely unachievable. What they did was, they set about dealing with what was essential, and they both did it pretty successfully.

The American academy is actually a terrible place for coming to understand how world politics works.

COWEN: Sorry. Is Germany still part of the Western Alliance? MEAD: Well, in the sense it’s been for some time. I remember that Kennan’s goal for Germany was to have a united, neutral, disarmed Germany at the heart of Europe. In some ways, [laughs] Kennan’s goal looks, maybe, closer than ever.

Look, I think Germany is a country whose basic economic model is now under question. The German model — and it’s very important in understanding that country — is based on the availability of cheap energy from Russia and large markets in China.

Again, let’s remember that the German establishment is more terrified of ordinary German public opinion than even the American liberal establishment is terrified of the Trumpists. You don’t have to look all that deeply into history to see why that would be the case. Providing stability, affluence, and employment for the mass of the German people is a key test of the legitimacy of the German state.

Really, ever since we failed to break up the large German corporations after World War II, that German establishment has been the motor of the astonishing success of postwar Germany. Now, suddenly, that engine is running out of fuel on the one hand, and its key customer, China, regardless of anything about human rights or geopolitics, the goal of the Chinese economic development strategy is to end its dependency on capital goods imported from countries like Germany by becoming an exporter of high-tech capital goods.

China’s development plans, much more than its Taiwan policy or its human rights, is a gun pointed at the head of German business. So, where do they go? It’s not clear where they go. I don’t think it’s clear to them where they go. That means that a fundamental element of the American alliance system is in a completely new place.

I think what we have to be doing in terms of analyzing where German foreign policy goes is to think a little bit less about ideology or things like the German anti-war sentiment or these kinds of things. Yes, these are all there, the Russian soul, all of that. It’s there, but really, how is Germany going to make a living? That’s the question that has to be answered, and that will drive Germany’s orientation in foreign policy.

I think, in our society, the ebbing of religion among some, certainly not all, Americans has tended to dissolve these bonds and leads, in all kinds of ways, both on the left and the right, to some of the sense of suspicion, of paranoia, a lack of trust, and declining support for democracy.

COWEN: How would you describe that advantage? MEAD: I don’t really believe in disciplines. I see connections between things. I start from reality. I’m not trying to be anti-intellectual here. You need ideas to help you organize your perceptions of reality. But I think there’s a tendency in a lot of social science disciplines — you start from a bunch of really smart, engaged people who have been thinking about a set of questions and say, “We’ll do a lot better if we stop randomly thinking about everything that pops up and try, in some systematic way, to organize our thinking of this.”

I think you do get some gains from that, but you see, over time, the focus of the discipline has this tendency to shift. The discipline tends to become more inward navel-gazing. “What’s the history of our efforts to systematize our thinking about this?” The discipline becomes more and more, in a sense, ideological and internally focused and less pragmatic.

I think that some of the problem, though, is not so much in the intellectual weaknesses of a lot of conventional postgrad education, but simply almost the crime against humanity of having whole generations of smart people spend the first 30, 35 years of their lives in a total bubble, where they’re in this academic setting, and the rule . . . They become socialized into the academy, just as much as prisoners get socialized into the routines of a prison.

COWEN: Do you think of it as an advantage that you don’t have a PhD? MEAD: Huge advantage.

COWEN: For our final segment, a few questions about the Walter Russell Mead production function. How much did growing up in South Carolina influence your views on foreign policy? MEAD: I think it’s affected my views of America, and that, in turn, affects my views. Growing up in the segregated South during the civil rights era, where, on the one hand, my father actually knew Martin Luther King and marched with him and was involved in a lot of things; but then I had relatives, older relatives who were very much on the other side. That gave me a certain sense of I could love my grandfather even though he voted for George Wallace.

MEAD: Yes. All right. The fact that I could love him while really disliking his politics helps me understand . . . I think it helps understand some of the divisions in America even today and gives you a more human rather than a strictly ideological look.

But there’s also this: that the South and the White South — which, of course, is where I come from — has had the experience of both being defeated and being wrong. That’s something that a lot of American political culture doesn’t have — your WASP Yankee patricians. I think neoconservatism reflected a sense of people who’ve never been wrong and never been beaten, at least in their own minds. There’s a hubris that comes with that.

Historically, one of the roles of Southern politics — think of William Fulbright during the Vietnam War — both for good and bad reasons, doubt that this American ideological project can be transferred, partly because they know America is bad at reconstruction. The failure of reconstruction, both in terms of the White South and the Black South after the Civil War, is a lesson that you get growing up in the South. And so you have an inherent sense of the limits of America’s ability to transform societies. That’s important.

COWEN: Your foreign policy understanding — what did it learn from going to Groton?

MEAD: Well, I learned a lot there. On the one hand, Groton is a place that prides itself on its tradition of producing foreign policy leaders: Dean Acheson, the Allsopp brothers, Averell Harriman, Franklin Roosevelt. That wonderful book, The Wise Men by David Halberstam — actually, my history teacher is in there. There’s a whole scene that could be from our fourth-form 10th-grade history class.

You got the sense of being part of a tradition, and you got the inside view. The way we were taught American history was in no way idealized. Just, say, reading something like the 1619 Project didn’t come to me as a shock. “Oh my gosh, there was slavery, there was injustice in America.”

In fact, one of the teachers at Groton used to take aside some of the boys — it was an all-boys school at the time — and explain to them how their family fortune was made. He might say, “Well, George, we’ve been reading a lot about war profiteers in World War I. You need to know that your grandfather . . .” Et cetera, et cetera. Unfortunately, none of my grandparents had participated in such things, so there was no need to explain to me the family fortune, as there wasn’t one.

More than that, though, I was at Groton ’65 to ’70. Those were the years of the Vietnam War. The national security adviser at the time, McGeorge Bundy, was the chair of the Groton Board of Trustees, so I had a close-up look at the aggressive self-confidence of the WASP establishment meeting the Vietnam War and beginning to come to grips with what was going wrong.

Those two visions of the inner workings of the American foreign policy elite, and then the ringside seat at the crisis of the old American foreign policy elite, have been profoundly important in my thinking about the world.

COWEN: You meet young people all the time. How do you spot the next Walter Russell Mead? What do you look for?

MEAD: Well, first of all, I’m hoping for somebody who’s a lot better than me. I’m looking for someone — what is it? Whose sandals I am unworthy to buckle. And I would say that I look for, first of all, curiosity, intense curiosity. I look for an understanding that the personal and the political are mixed, that character matters. You can learn about the world by coming to understand your own psychological flaws and distress, and vice versa.

That history matters a lot, and that you can’t know too much history. Now, you have to digest it, but you can’t know too much history. A hunger for travel. I think too many foreign policy types don’t actually get out into the field nearly as much as they should. Curiosity about other cultures. A strong grounding in a faith of your own, which can be a secular ideology, perhaps, in some cases, but more often is likely to be a great religious tradition of some kind.

I’m a Christian. I could wish that everyone was, but my friend Shadi Hamid is a Muslim, and I think his Muslim faith actually helps him navigate and understand the world, and I certainly have lots of Jewish friends in the same circumstance. Again, we’re ending up where we started, maybe, but a religious faith, connected to one of the great historical traditions, gives you a degree of insight and potential for self-criticism that are absolutely crucial to foreign affairs.

From the start of the American experiment the language of freedom applied only to a privileged few.

At the time of the Constitutional Convention in Philadelphia, only 2 percent of the city’s population were qualified to vote.

overtake freedom’s meaning entirely, harnessing freedom solely to projects of exclusion, privilege and harm.

In the 20th century, racial segregation was justified as the freedom of white people to control public space and make their own business choices.

It is true the language of freedom was central to emancipation, suffrage and democratic movements of all kinds, but it has also justified violence and discrimination.

more and more laws, caucuses, rallies and hard-right movements use the language of freedom as a cudgel to erode democratic governance and civil rights; these laws expand the creep of authoritarianism.

Slave codes allowed white property owners to possess Black humans — creating what the historian Tyler Stovall called “white freedom,” the “belief (and practice) that freedom is central to white racial identity, and that only white people can or should be free.” This freedom for the white master extended to torture, rape and lifelong control over the humans he (or she) owned.

The ugly freedoms in American politics today increasingly justify minority rule, prejudice and anti-democratic governance. If we don’t push back against their growing popularity, we will have ceded what freedom means to those who support monopolistic rule and furthered the country’s downward slide toward authoritarianism.

One 12th-grade student in Kabul said the decision had stamped out her last bit of hope that she could achieve her dream of becoming a lawyer.

“Education was the only way to give us some hope in these times of despair, and it was the only right we hoped for, and it has been taken away,” the student, Zahra Rohani, 15, said.

On Monday, the Ministry of Education had announced that all schools, including girls’ high schools, would reopen on Wednesday at the start of the spring semester. The following day, a Ministry of Education spokesman released a video congratulating all students on the return to class.

Mehrin Ekhtiari, a 15-year-old student in 10th grade, said she and her classmates were shocked when a teacher announced the news to the classroom on Wednesday morning.

“My hope was revived after eight months of waiting,” she said, adding later that the announcement had “dashed all my dreams.”

In recent months, the Taliban had also come under mounting pressure to permit girls to attend high school from international donors, aid from which has helped keep Afghanistan from plunging further into a humanitarian catastrophe set off by the collapse of the former government and Western sanctions that crippled the country’s banking system.

. He attributed the decision to a lack of a religious uniform for girls and the lack of female teachers for girls, among other issues.

Many principals and teachers said they only received the new instructions from the ministry after students had already arrived for classes Wednesday.

The move came a little more than a week before a pledging conference where the United Nations had hoped donor countries would commit millions of dollars in badly needed aid, as Afghanistan grapples with an economic collapse that has left over half of the population without sufficient food to eat. It is unclear whether donors will be willing to contribute following the Taliban’s abrupt reversal on the key commitment of girl’s education.

The Taliban on Wednesday abruptly reversed their decision to allow girls’ high schools to reopen this week, saying that they would remain closed until officials draw up a plan for them to reopen in accordance with Islamic law.

When schools reopened in September for grades seven through 12, Taliban officials told only male students to report for their studies, saying that girls would be allowed to return after security improved and enough female teachers could be found to keep classes fully segregated by sex.

Later, Taliban officials insisted that Afghan girls and women would be able to go back to school in March, and many Western officials seized on that promise as a deadline that would have repercussions for the Taliban’s efforts to eventually secure international recognition and the lifting of at least some sanctions.

“I’m deeply troubled by multiple reports that the Taliban are not allowing girls above grade 6 to return to school,” tweeted Ian McCary, the chief of mission for U.S. Embassy Kabul, currently operating out of Doha, Qatar. “This is very disappointing & contradicts many Taliban assurances & statements.”

At one girls’ private high school in Kabul, more female students had arrived for classes Wednesday morning compared to previous years, the school’s principal said in an interview.

“They came to my office, crying,” said the principal,

The decision “doesn’t make sense at all, and it has no logic,” the principal added, noting that the new government has had over seven months to design a new uniform and address the teacher shortage.

Since seizing power, the Taliban have been reckoning with the need for consistent policies while struggling to tread a delicate line that satisfies their more moderate members, their hard-line base and the international community.

The sudden reversal on the girls’ secondary schools seemed to validate existing concerns among Western donors that, despite assurances, they are dealing with much the same Taliban as the 1990s.

“The Taliban have been solidifying their position and becoming hard-line on a lot of issues,” Mr. Bahiss said.

In recent months, the new government has issued restrictions on local media and cracked down on peaceful protests. Taliban officials have also issued new restrictions on women, including a ban on traveling farther than 45 miles in a taxi unless they are accompanied by a male chaperone.

“You can’t exercise your other rights if you can’t leave your house to attend your job or attend education classes,” Ms. Barr said. “It’s a really alarming sign of what may be to come, it’s likely to herald further crackdowns on women.”

As the Senate's questioning was close to winding up Wednesday, Jackson -- at the request of California Democratic Sen. Alex Padilla -- reflected on what message she'd give to young people feeling doubtful of their own abilities as they watched her ascent. She recalled feeling out of place and homesick during her first semester at Harvard University as an undergraduate

Coming out of the hearings, Democrats were insistent as ever that Jackson belonged on America's highest court and that they intended to put her there. "She will be confirmed. She will be a star on the Supreme Court," Sen. Patrick Leahy, a Vermont Democrat, said after Wednesday's hearing. "And I for one will proudly cast my vote for her."

In the lead-up to the hearings, Republicans previewed a "dignified" approach to the nominee that would be "respectful" in tone and "substantive" in content.

"underscores the dangers of the kind of progressive education that we are hearing about."

Several of Jackson's harshest questioners are believed to be in contention for a 2024 presidential run. Other talking points GOP has forecast for the 2022 midterm campaign also made their way into the questioning. Cruz badgered her about "critical race theory" -- an academic discipline that looks at system racism, even as Jackson insisted it plays no role in how she approaches judging. At one point he grilled her on the presence of the children's book "Antiracist Baby" in the curriculum of the private school for which Jackson serves on the board.

The proceedings were at their ugliest in the lines of Republican inquiry focused on the sentences Jackson handed down in select set of child pornography cases. Republicans argued that she was unduly lenient towards those offenders -- a claim at odds with the fact that her record is mostly in line with how judges typically approach these cases.

The Republicans said that they were disappointed she didn't identify a specific judicial philosophy -- like the originalism or textualism strains favored by conservatives -- that she followed. But just as notable was the distance she put between herself and the judicial approaches that had typically been heralded by progressives.

Republicans make a case for the Supreme Court to revisit Roe, same-sex marriage and other key rulings

He suggested that the legal basis for that ruling -- a concept known as substantive due process, that also underpins rulings on interracial marriage and birth control -- was principle that "allows the court to substitute its opinion for the elected representatives of the people."

While Foote and some librarians are fighting for these books to stay on shelves, others disagree and are fighting to keep them off."I felt that I had a duty as a parent, because this type of material is so over the top in terms of inappropriateness … I felt I had a duty as a parent, to warn other parents and to bring it to the attention of the school board, because quite honestly, you know, I didn't know at that moment who's making these decisions as to what books are put into our school library," Stacy Langton, a Virginia mother and co-founder of Mama Grizzly, a conservative grassroots organization that she says aims to protect "our children's learning environments."

In other states, including North Carolina, Maine and Missouri, Republicans have begun campaigns targeting books that deal with segregation and racism.However, according to an American Library Association poll, 71% of Americans are opposed to banning books.

"It's just really important that we understand that just because we read something or watch a TV show or read a newspaper article, it doesn't mean we personally or our students are going to go out and enact anything they read about. Books just have ideas in them, and ideas cause us to think, and we can use our own minds to make critical decisions. And as educators ... we train students to ask critical questions like, 'Where did this data come from? And who wrote this? What is their point of view?'" Foote said."And I think that if parents considered that point of view, then they would understand that we're all in this together as partners," she added.

he started receiving death threats. People said they wished he and his family had been killed by drug lords, told him that “sooner or later your punishment will arrive” and proposed that he be nailed into a coffin or run over by a cement roller.

Mr. Moreno, who grew up in Colombia, began working as a researcher in a computer science and robotics lab in Paris in 1983; the career that followed involved creating a start-up, meeting the Dalai Lama and being named a knight of the Légion d’Honneur. His work has won several awards and spanned many fields — automotive, medical, nuclear, military, even home goods.

Many of the recent threats have been directed at scientists studying Covid-19. In a survey of 321 such scientists who had given media interviews, the journal Nature found that 22 percent had received threats of physical or sexual violence and 15 percent had received death threats

Last year, an Austrian doctor who was a vocal supporter of vaccines and a repeated target of threats died by suicide.

increasingly, even professors and researchers without much of a public persona have faced intimidation from extremists and conspiracy theorists.

Around 2010, he started thinking about how technology could help create sustainable cities. Eventually, he refined his ideas about “human smart cities” and “living cities” into his 2016 proposal for 15-minute cities.

The idea owes much to its many predecessors: “neighborhood units” and “garden cities” in the early 1900s, the community-focused urban planning pioneered by the activist Jane Jacobs in the 1960s, even support for “new urbanism” and walkable cities in the 1990s. So-called low-traffic neighborhoods, or LTNs, have been set up in several British cities over the past few decades.

Critics of 15-minute cities have been outspoken, arguing that a concept developed in Europe may not translate well to highly segregated American cities. A Harvard economist wrote in a blog post for the London School of Economics and Political Science in 2021 that the concept was a “dead end” that would exacerbate “enormous inequalities in cities” by subdividing without connecting them.

Jordan Peterson, a Canadian psychologist with four million Twitter followers, suggested that 15-minute cities were “perhaps the worst imaginable perversion” of the idea of walkable neighborhoods. He linked to a post about the “Great Reset,” an economic recovery plan proposed by the World Economic Forum that has spawned hordes of rumors about a pandemic-fueled plot to destroy capitalism.

A member of Britain’s Parliament said that 15-minute cities were “an international socialist concept” that would “cost us our personal freedoms.” QAnon supporters said the derailment of a train carrying hazardous chemicals in Ohio was an intentional move meant to push rural residents into 15-minute cities.

“Conspiracy-mongers have built a complete story: climate denialism, Covid-19, anti-vax, 5G controlling the brains of citizens, and the 15-minute city for introducing a perimeter for day-to-day life,” Mr. Moreno said. “This storytelling is totally insane, totally irrational for us, but it makes sense for them.”

The multipronged conspiracy theory quickly became “turbocharged” after the Oxford protest, said Jennie King, head of climate research and policy at the Institute for Strategic Dialogue, a think tank that studies online platforms.

“You have this snowball effect of a policy, which in principle was only going to affect a small urban population, getting extrapolated and becoming this crucible where far-right groups, industry-sponsored lobbying groups, conspiracist movements, anti-lockdown groups and more saw an opportunity to insert their worldview into the mainstream and to piggyback on the news cycle,”

The vitriol currently directed at Mr. Moreno and researchers like him mirrors “the broader erosion of trust in experts and institutions,”

Modern conspiracy theorists and extremists turn the people they disagree with into scapegoats for a vast array of societal ills, blaming them personally for causing the high cost of living or various health crises and creating an “us-versus-them” environment, she said.

“I am not a politician, I am not a candidate for anything — as a researcher, my duty is to explore and deepen my ideas with scientific methodology,” he said. “It is totally unbelievable that we could receive a death threat just for working as scientists.”

a 2022 Reuters investigation found that some American clinics were quite aggressive with treatment: None of the 18 U.S. clinics that Reuters looked at performed long assessments on their patients, and some prescribed puberty blockers on the first visit.

As Cass writes in her report, “The toxicity of the debate is exceptional.” She continues, “There are few other areas of health care where professionals are so afraid to openly discuss their views, where people are vilified on social media and where name-calling echoes the worst bullying behavior.”

The report’s greatest strength is its epistemic humility. Cass is continually asking, “What do we really know?” She is carefully examining the various studies — which are high quality, which are not. She is down in the academic weeds.

he notes that the quality of the research in this field is poor. The current treatments are “built on shaky foundations,” she writes in The BMJ. Practitioners have raced ahead with therapies when we don’t know what the effects will be. As Cass tells The BMJ, “I can’t think of another area of pediatric care where we give young people a potentially irreversible treatment and have no idea what happens to them in adulthood.”

Our natural human tendency is to be too confident in our knowledge, too quick to ignore contrary evidence. But these days it has become acceptable to luxuriate in those epistemic shortcomings, not to struggle against them. See, for example, the modern Republican Party.

In 1877 a British philosopher and mathematician named William Kingdon Clifford published an essay called “The Ethics of Belief.” In it he argued that if a shipowner ignored evidence that his craft had problems and sent the ship to sea having convinced himself it was safe, then of course we would blame him if the ship went down and all aboard were lost. To have a belief is to bear responsibility, and one thus has a moral responsibility to dig arduously into the evidence, avoid ideological thinking and take into account self-serving biases.

“It is wrong always, everywhere, and for anyone, to believe anything upon insufficient evidence,” Clifford wrote

A belief, he continued, is a public possession. If too many people believe things without evidence, “the danger to society is not merely that it should believe wrong things, though that is great enough; but that it should become credulous, and lose the habit of testing things and inquiring into them; for then it must sink back into savagery.”

Since the Trump years, this habit of not consulting the evidence has become the underlying crisis in so many realms. People segregate into intellectually cohesive teams, which are always dumber than intellectually diverse teams. Issues are settled by intimidation, not evidence

her core conclusion is this: “For most young people, a medical pathway will not be the best way to manage their gender-related distress.” She realizes that this conclusion will not please many of the young people she has come to know, but this is where the evidence has taken her.

She writes in her report, “The option to provide masculinizing/feminizing hormones from age 16 is available, but the review would recommend extreme caution.