"Bush has always been too certain to admit error, too steady to turn the wheel when the road bent, and too preoccupied with principle to understand that principle wasn't enough. That was his downfall in Iraq."

Watch the documentary No End In Sight and you might rethink that assessment. <link>

your comment implies that Bush may rethink policies when presented with new evidence. That movie is about how he never had any evidence upon which to base policy in the first place, but simply devises policies to advance his own interests. So the movie actually reinforces some of the ideas put forth in this article - i.e., that Bush is an idiot when it comes to policy-making.

That film isn't really about why he took America to war in Iraq. It really focusses on how the policy was executed. It could certainly reinforce the the idea of Bush being in complete denial of reality, but unless he thought "freedom" actually meant "chaos", principles themselves have been completely absent in the doing.