[headsplice]

Which Bush doctrine are you referring to?
If you mean pre-emptive aggression to topple a regime, then the Bush doctrine worked perfectly. That's exactly what happened.
Unfortunately, the Bush folks forgot that when they break other people's toys, they're responsible for fixing them , since we're (the US) is supposed to have the moral high ground (shining beacon on the hill and what not). Sticking the American military's head in the secular/religious buzzsaw that is the Middle East was incredibly stupid, particularly because there was such strong resistance to invasion back here. The only way to win in the Middle East is to do what foreign invaders have always done, invade, conquer, and enforce their rule, no matter what the consequences to the local population. Imperialism being out of favor puts a damper on our ability to do that.