First, of course, the debit side must be noted, foremost the human cost, to date: about 4,000 dead American troops, about 30,000 injured, perhaps half seriously, including more than 600 amputees and about 3,000 diagnosed traumatic brain injuries. Many more Iraqis have been killed. The financial cost of the war will run above $1 trillion. We have also, at least temporarily, driven thousands of Muslims into the radical ranks, created great enmity in much of the Muslim world (and not a little in Europe also.)
