Iraq ISN'T Washington, D.C., and that's the point! Yes, if we leave Iraq, we will fight them elsewhere. Wouldn't you really rather fight them there and be done with it, or would you rather they show up somewhere else, perhaps somewhere in Europe?
Bush was so certain of Iraq's importance that he spent 3000 good men and women, 1 trillion dollars, and the Reagan Revolution on it. The tragedy is that we could have fought these same men in Afghanistan or Western Pakistan. We could have killed the REAL architect of 9/11 instead of letting him hide out in the mountains for the past six years.
Bush isn't Horatio, he's Hector, letting bad judgement and pride lead him to ruin.