Bin laden was an outcast. He left Saudi Arabia and went around to various places and at one point ended up in Northern Africa where he was engaged in evicting the Americans from Somalia. He said that the Americans he fought in Somalia were so weak and retreated so readily that it opened his mind to the possibility of inflicting real damage to the United States. But around this time he became more high profile and was evicted from his host country and wasn’t welcome anywhere, including Saudi Arabia. That should be a big hint about the Saudi theory. He made an appeal to the UK for political asylum, which based on his rhetoric at the time was like hitler asking for asylum in Israel. If the UK had granted him asylum 9/11 wouldn’t have happened. But they didn’t.
From there he ultimately moved on to Afghanistan and the tribal regions of the Pakistan border where there is no presence of government.
Bin laden was a religious fanatic who outwardly pursued The universal adoption of islam and protested foreign occupation of the pan-Arab community, even the willful presence of US troops in Saudi Arabia after the invasion of Kuwait. He killed 3,000 people because the saudis willingly hosted American troops. Mind-bending. But this leads to the next point which is that despite his outward behavior, inwardly he probably had political ambitions and all indications point to yet another repetition of history in that region — a small group of people justify violence in the name of Islam and then promptly transform into a conventional state, built upon violations of Islam, as soon as they have captured the material means to do so. Bin laden, who probably thought 9/11 would cause the United States to remove itself from the Middle East, only made it to step one.
And this has interesting consequences for the future landscape of terror. We probably won’t see another attack from the Middle East. Attacks from these groups are almost always pragmatic, even if they are done in the name of “Islam,” and almost always the pragmatic target is some other player in that region.