I think it's worthwhile for proponents of withdrawal to be honest about the likely aftermath of pulling out: an intensified civil war that will take the lives of tens of thousands and end in the installation, at least in the short-term, of an Iran-friendly theocracy. This is obviously not a happy outcome, but neither is it the catastrophe the Chaos Hawks peddle. The alternative is to babysit the civil war with American troops, spilling blood and treasure along the way, without truly affecting the course of events in any substantial measure.
Politically, this is the key battleground now. As long as the Chaos Hawks are able to panic the public into believing that withdrawal will result in a Middle East in flames and ten dollar gasoline at home, no Congress will have the backbone to defund the war and force a pullout. This means that it's time for more sensible regional professionals to screw up their courage and tell the truth: pulling out won't be pretty, but if it's done prudently neither will it be Armageddon. The sooner we figure this out, the sooner we can leave Iraq.
As the kewl kidz say, read the whole thing.