Yglesias notices a sleight of hand:
[W]hen it comes to military operations you can’t just bracket the question of feasibility. If the administration’s plan is fatally flawed and simply leads to several more years of fighting followed by inevitable withdrawal and Taliban takeover, then we’re not actually helping anyone. This is why things like Richard Just’s insistence on trying to understand everything through a lens of “realism” versus “idealism” are so annoying. If the administration has a workable plan to bring stability to Afghanistan, then implementing that plan will have humanitarian benefits. But if the plan’s not workable, then it’s not workable, and it doesn’t matter how idealistic or ambitious you try to make it.