...Wars are easy to start but rather harder to stop - and, as Washington should have learned in Afghanistan, Iraq and Syria, when they do eventually stop, it's not in any place that would have seemed remotely plausible back when you started. In Kabul, you hand the Taliban back more territory than they'd held twenty years earlier; in Baghdad, you invest a fortune in blood and treasure to create a highly functional client state of Iran; in Damascus, you buy a new suit for the al-Qaeda honcho's blood-soaked deputy you let talk his way out of Abu Ghraib, and then...