"We see, therefore, that war is not merely an act of policy but a true political instrument, a continuation of political intercourse carried on with other means. What remains peculiar to war is simply the peculiar nature of its means." -- Carl von Clausewitz
Now, the past decade of war has been against enemies which do not have the authority, power, or will to be dealt with politically. The obvious question, then, is how we can be fighting a war--we are going after the criminals that hit us, no?
Even a defense wherein we say "Aha! But the Taliban and Saddam regime were opposed to us, politically!" is flawed, for we had successfully conducted combat operations against their regular forces and won by any reasonable definition of the phrase. We now find ourselves in a long and bloody occupation---for that is what this is, and an occupation is not a war.
To be even more blunt about this, we cannot simply ascribe the bombing of an Afghan village as an unfortunate side-effect of total war.
We are not engaged in total war, we are not engaging an enemy which has hills and manufacturing capacity worth our bombs and weapons--this is no Dresden or Hiroshima or Nagasaki.
Hiding behind "War is hell" at the very least requires us to be engaged in an honest war, and this we are not.