When the last American combat troops departed Iraq in December, they left behind a disordered democracy that may not survive, along with a great deal of ethical confusion. The invasion of Iraq in 2003 represented the apotheosis of “anticipatory” self-defense—the theory that the use of armed force can be justified to prevent an attack that “is neither occurring nor imminent, but nevertheless likely to occur in the foreseeable future.” According to the war’s critics, the failure to discover weapons of mass destruction illustrates the poverty of the theory and its heavy reliance on accurate intelligence. If this is so, then we are in for trouble, because the Obama Administration’s emphasis on targeted killing of terror suspects—what President Obama has called eliminating our enemies—is also a form of anticipatory self-defense. Indeed, as the administration continues to ratchet up its use of remote drone attacks, we really would seem to have entered what one observer has called the new age of preventive war. [...]











