Andrew Sullivan argues that resentment is at the heart of European anti-Americanism:

From any rational point of view, the end of the Saddam regime in Baghdad cannot be a huge blow to European interests. In fact, it's pretty much a no-brainer, a necessary international police action to remove an obvious potential threat from terrorists and weapons of mass destruction. Saddam is the easy case, not the hard one. So why the intensity of the opposition - even to the point of wrecking NATO and splitting Europe in two? Resentment, I posit. Resentment. And that resentment - which is not manufactured by European leaders, merely tolerated by them - is bound to have a deep effect on the future of international relations. This current crisis is just the beginning of a realignment that could be profound.