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Bottom line for me is I can separate all the things you mention and direct blame to different folks. You blame bush because you believe that he is where the buck stops.
I understand that perspective but I think there are plenty of others who bear more blame for all the things that have happened in IRaq and because of it than Bush.
I also separate the decision to invade with the execution of the war. hindsight is an easy way to argue this but, given what we knew and the state of the world at the time, we acted in the interests of Iraq and what we thought was the right thing to do given the aftermath of 9/11.
But, you're right - overall - we failed miserably. But, not entirely.