Where do you go with this? We nuked Japan in 4 years. We didn't split hairs over which group or whom sponsored their attack on us, so why all this introspection NOW? No. Oil, and the fact Saudi Arabia is the perpetrators. And all goes out the window.
You're trying to compare a country at war with a bunch of cavemen who wanted to attack a country. Two totally different scenarios.
Bin Laden represented radical Islam, not the Saudi government. In fact if you read the history of 911, you'd find that elder Bush had the Saudi government kick Bin Laden out of the country, and that's what launched his war against us. Bin Laden objected to the infidel making oil deals with people of (what he considered) his holy land, and demanded that the Saudi government stop.
Afterwards, he moved to another country (I believe it was the Sudan) and he started terrorist camps. GHW Bush found out about it, and had Sudan kick him out too. So the guy was really getting pissed. That's how he ended up in Afghanistan.