This should surprise me

But it doesn't.

Bush considers himself the Decider, that is what he calls himself. Anyone that calls themselves that will never take advice from someone else, atleast not when it is presented as advice. Then that would mean he had made the wrong choice in the past, and as Everyone should know by now, Bush never makes a mistake. It is always an someone else's fault.
On things he doesn't care about, like taxes or stem cells, you could get him to change his mind. But he has decided that leaving Iraq IS LOSING. And he will never do that. Fuck the troops, fuck everyone, He will be better than dear old dad.