To me the wars are more of a response to America's high state of emotion after 9/11, judging by the amount of people (even in political positions) who at the time agreed to them.
I'm also not saying it was a war based on emotion, but that the high tension and emotion levels obviously had a lot to do with it being acceptable at the time. I'd say it was the American peoples revenge though, not the revenge of GWB.
One can say the US wanted to protect the "people" and it's classy, but there are other places that need a lot more help (like Congo, where over 5.4 million people have died in/because of war since 1998).