Paul Krugman: “Donald Trump’s Iran debacle is by no means the first war the United States has lost in modern times. In Vietnam and in Afghanistan, America was similarly defeated by enemies that were nominally less advanced yet implacable. The humiliating images of the last helicopter taking off from Saigon, and the chaos of the mad scramble to board the last plane departing in Kabul, are reminders of the folly of forever wars that are bound to lose the support of the American people.”“But the loss to Iran is different: it is the closest we have come to outright military defeat. U.S. forces pulled out of Saigon and Kabul, not because they had been beaten in battle, but because the domestic political cost of propping up client regimes became too great.”