Oddly enough, you. I'm sort-of convinced Bush got the wrong Ira on this one (ie - we should've gone after Iran first). But since we're in Iraq, we'd better fix it up or else everyone and his brother will be convinced the US is a paper tiger.
We don't attack countries that really have WMD.
Think of the broader strategy and it all falls into place. Keep repeating. Iraq is just a stepping stone.....look at the map. What two countries with US troops currently in them border a MAJOR enemy of the US?
Afghanistan and Kyrgyzstan both border China, but I don't think that invading China will convince them to revalue the yuan.