Niklas,
It's not only about Oil. I mean it's got nothing to do with Oil. Oil is important as far as a source of revenue to finance their war. Unfortunately, far from being their only one.
bin Laden target is not US out of Arabia. bin Laden target is a 2 step one. First, unite Arabian countries (something of the utmost difficulty, but I concede western attitude has ease things tremendously in this regard). Second, destroy western civilization. As simple, as crude, as that.
bin Laden, and his likes, are muslims, but muslim is not the key here. Not all of them are like him, thank God. bin Laden is a fundamentalist. That's the key point. I don't care what is the underlying ideology/religion of a fundamentalist. The thing that makes them non-compatible with humanity (as we know it) is they see life of innocent as a tool to reach their goals. They would use ANY mean to get to their objectives. And Ripsnort hit it fair and square: ALL terrorist, each and every one of them. They are all birds of a feather, regardless the underlying "ideology".
In the horrendous mass murder America has suffered, muslims will suffer too. Islam is not bad per se. Fanatism is. All of us have to make an effort and focus the real enemy. If you kill muslim fundamentalism and pay no attention to the rest, sooner or later you will find yourself in the same bin again. Different faces, same problems.
We have a lengthy experience in Spain about politic fundamentalism. And terrorism derived from that. We've been cheating ourselves, we've been extremely cautious when dealing with them beasts. We've been pretending (still some are pretending) we have a political issue and that, in the name of our values, we have to be comprehensive with criminals. Dialog. Ha! Look at the results in our particular case.
Face it once and for all: politics, religion, territory, oil...have nothing to do with the real issue. The real one is Fanatism, and Terrorism associated with it. Each and every individual who commits, support, finance, hide, protect in whatever way or manner these kind of acts, this kind of thinking, is my enemy, regardless his motivation. In my book, they're not humans. They would not be more extrangers should they come from Mars.