The whole argument is fake. It's a blatant lie, in the sense that's only half and superficial truth.
The deep one is that we have an organized, whealthy and, by my standard, evil power that uses people's primary instincts to fuel anger against an enemy. Western countries could be perceived as causing Palestininan or whatever other country's misery. Apart from being false, this is not relevant, as to what are the ultimate cause of this aggression and what we should expect from now on, or even if solving that problem would solve the Terrorist War one. Don't fool yourselves. This is not a palestinian or even arab issue. This is a muslim fundamentalist in first instance, and a perverted morality system ultimately, if you widen the scope to accomodate all terrorists. In the particular case of the muslim fundamentalists, when they (eventually) have Palestina back, they would ask for more. Their goal is not land or justice. Their goal is to prevail over western sinful societies. And this as far as Laden's struggle. But you can extend to whatever terrorist group you can think of: people ready to kill inocent people and commit mass murder to defend certain ideology.
Palestinians are current Laden's aliby. He is using anger to unite them against western countries, starting with Big Brother U.S.A. He will use his success in striking U.S.A. to enhance cohesion amongst his followers. But, sadly, he will not want to stop until western countries way of living is buried. His funds come not only from his personal whealth, but from islamic organizations throuought the world, so it's not an individual alone. He has quite a bit of simpatizers. And he wants more, much more, than palestinians back to the west bank. Learn from Afghanistan lessons. What did talibans do there? Why do you think they would act differently? and, most important: facing that, what is the real importance of who is the ultimate responsible of palestinian, or any other cannon fodder's situation? Whatever you try to justify, whatever you say, it will be ill-interpreted.
Face it, we have an enemy around, not outside. Terrorism is its sign. Fanatism is its way of thinking. Death of the enemy is its ultimate goal.