Conor Friedersdorf makes the case:
Give the hawks their due: terrorism is an ongoing threat to the United States. In fact, it’s likely to pose a bigger threat with every year that passes, insofar as technological advances are permitting people with meager resources to obtain ever deadlier weapons. Heaven forbid they get a nuke or a killer virus. What the hawks fail to recognize, however, is that perpetual war poses a bigger threat to the citizenry of a superpower than does terrorism. Already it is helping to bankrupt us financially,undermining our civil liberties, corroding our values, triggering abusive prosecutions, empoweringthe executive branch in ways that are anathema to the system of checks and balances implemented by the Founders, and causing us to degrade one another.
Alas, we still have an ambiguous exit strategy from the Middle East.