Sure, there are wealthy regimes in Saudi Arabia and Kuwait, but a lot of Arabs in that part of the world have very hard lives. There's economic and cultural resentment at work, too. There's something in common with the anti-globalization protestors in Seattle, D.C., and Genoa. American-style capitalism is invading their homeland and attacking their traditional culture. In a number of these countries, Palestine and Afghanistan in particular, life is very violent.
Young men die every day.
There just isn't a lot of prospect for a better life, so its not hard to find folks willing to die to make life better for their fellow Arabs. Throw some religious fundamentalism into the mix, which has a very potent message to such people, and you've got a lot of foment looking for an outlet. Leaders like Bin Laden and Saddam Hussein play to this situation quite well, setting themselves up as heroes for opposing the West and the U.S. in particular. And look at us here in the U.S., with our high standards of living, our low standards of morality, and our unrelenting drive to recreate their world in our image. The U.S., the world's only superpower, that uses its might to starve and kill innocent civilians and to prop up Israeli apartheid.