Indeed. The worst thing is, I don't think US was quite prepared to go all the way through even when they started. In fact, the very idea was badly conceived, and to actually subvert the region would likely require a lot more than the US will ever be willing to do. They essentially pulled in, ousted dictators and pulled out, hoping that "power of democracy" or something will make a stable, US-friendly government. It turned out Middle Eastern people don't quite work the same way as US people (same problem as with US and Russia - their way of thinking is different on a fundamental level), and the place reverted to what it was before the invasion, then quickly got worse because there was no single, strong leadership.
The US seems to be neither capable of playing by the local rules nor imposing their own with any degree of efficiency. The people in charge (nor the public, for that matter) either did not grasp what it'd take to truly "win" that war, or were not willing to go through with it (because that'd require doing some very "un-American" things). In a way, the situation was similar to what happened in Vietnam - "Let us declare victory and get the hell out". Only this time, the fallout is considerably worse.