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But the local food movement now threatens to devolve into another one of those self-indulgent — and self-defeating — do-gooder dogmas. Arbitrary rules, without any real scientific basis, are repeated as gospel by “locavores,” celebrity chefs and mainstream environmental organizations. Words like “sustainability” and “food-miles” are thrown around without any clear understanding of the larger picture of energy and land use.

The statistics brandished by local-food advocates to support such doctrinaire assertions are always selective, usually misleading and often bogus. This is particularly the case with respect to the energy costs of transporting food. One popular and oft-repeated statistic is that it takes 36 (sometimes it’s 97) calories of fossil fuel energy to bring one calorie of iceberg lettuce from California to the East Coast. That’s an apples and oranges (or maybe apples and rocks) comparison to begin with, because you can’t eat petroleum or burn iceberg lettuce.

The real energy hog, it turns out, is not industrial agriculture at all, but you and me. Home preparation and storage account for 32 percent of all energy use in our food system, the largest component by far. A single 10-mile round trip by car to the grocery store or the farmers’ market will easily eat up about 14,000 calories of fossil fuel energy. Just running your refrigerator for a week consumes 9,000 calories of energy. That assumes it’s one of the latest high-efficiency models; otherwise, you can double that figure. Cooking and running dishwashers, freezers and second or third refrigerators (more than 25 percent of American households have more than one) all add major hits. Indeed, households make up for 22 percent of all the energy expenditures in the United States. Agriculture, on the other hand, accounts for just 2 percent of our nation’s energy usage; that energy is mainly devoted to running farm machinery and manufacturing fertilizer. In return for that quite modest energy investment, we have fed hundreds of millions of people, liberated tens of millions from backbreaking manual labor and spared hundreds of millions of acres for nature preserves, forests and parks that otherwise would have come under the plow.

Quite a bit of rough stuff was bandied about in one of the final Supreme Court decisions of the term released last month — dismembering, bondage, decapitation, a bounty of bloodletting in video games that bring the thrill of the kill to new levels. No problem there, in the view of the court: for children who want to simulate brutal homicide, it’s protected free speech.Sex, not so good. Naked women. Naked men. Fornication. Ewww! The black-robed majority made it clear that the United States of America will always make an exception for sex: “historically unprotected speech,” in the words of Justice Antonin Scalia, who wrote the 7-2 video game opinion.

The take-away point from Brown v. Entertainment Merchants Association was that the court continued to expand freedoms granted by the First Amendment. But in overturning a California attempt to ban underage video game sales, the case revealed a fascinating intra-justice discussion about modern depictions of sex and violence — why one can be censored, and the other cannot.Ultimately, the back-and-forth by the high court reinforced the notion of a nation that will always be a little skittish about sex, while viewing violence as American as apple pie. If this ruling is indeed a triumph for the First Amendment, it continues a strange double standard.

In dissent, Justice Stephen Breyer pressed the issue of why it was O.K. to protect children from sexual images but not from the worst kind of human carnage. His zinger points merit a second look before court-watchers settle into their Adirondack chairs for the summer:But what sense does it make to forbid selling to a 13-year-old boy a magazine with an image of a nude woman, while protecting a sale to that 13-year-old of an interactive video game in which he actively but virtually binds and gags the woman, then tortures and kills her?Breyer expanded further, pointing to the absurd implications of the court’s drift. “What kind of First Amendment would permit the government to protect children by restricting sales of that extremely violent video game only if the woman — bound, gagged, tortured and killed — is also topless?”