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The Taliban are opposed to the Islamic State and actively fight against them, but that has not changed their relationship with al-Qaeda. So, though unlikely to conduct terrorist attacks themselves, the Taliban are also unlikely to clamp down on al-Qaeda. The experience of U.S. retaliation for the 9/11 attacks has done little to chasten them, partly since they believe they have defeated the United States. In their minds, they taught us a lesson, not the other way around. Indeed, the Taliban promise in the Doha talks to prevent attacks on other countries from their soil parrots the assurance Mullah Omar gave before 2001 that Osama bin Laden would do no harm to the outside world.

The fact that a president cannot discount an attack does not mean that the United States must stay in Afghanistan. How do we know preventing attacks is worth billions of dollars per year in operational expenses and some number of fallen Americans? Key variables that a president would want to weigh for that decision are unknown and likely to remain unknown: How soon might an attack occur? Will it be within the next election cycle? How big will an attack be? Will it be another 9/11 or a smaller scale Islamic State-style event? How often will attacks occur? Can very limited interventions (like an airstrike on an al-Qaeda base) prevent them? The answers are highly subjective because they demand looking years into the future under different circumstances than today. What to do consequently depends more on point of view and risk tolerance than evidence.

Although critics argue that Afghanistan is only one of several terrorist safe havens facing the United States and deserves no special treatment, a very convincing case can be made that, as the home of the jihad, Afghanistan would be a source of inspiration for new recruits and a rallying point for foreign fighters

even small-scale terrorist attacks in the United States could breed paranoia and racism at home. Billions of dollars in operational expenses abroad may conceivably be worth preserving liberties.

The United States faces many threats, not all in the security realm. Why should such a high level of funding be devoted to dealing with one particular threat of unknown timing, scale and frequency? The funds could be better spent elsewhere. Additionally, the United States is a resilient nation. Americans suffer human loss every day and endure, and periodic terrorist attacks would be no different. It is even possible that U.S. homeland defenses, which have matured since 2001, could deflect an attack. From this point of view, spending billions in Afghanistan is a luxury, a high-end insurance policy against an exaggerated risk

The U.S. president and the American people need to decide if a terrorist threat of unknown timing, magnitude and frequency is truly so worrisome that it warrants spending billions and losing American lives.

The tricky thing is that as long as casualties on U.S. soil risk domestic backlash, presidents will find it hard to escape Afghanistan. If we want out, we need to temper our sensitivity to tragic albeit perhaps bearable terrorist attacks. Only our own fears dictate that we must stay in Afghanistan.