'conclusive proof? re OBL , I think you would be hard pressed to find any Moslems who seriously refuse to believe that OBL and Al Qaeda were behind the sept 11 terror attacks (of course those videos of him gloating over the towers collapsing were digitally faked. sure. Hollywood can do anything). (and of course Ahmed Ressam and Ramzi Yousef were just tourists vacationing in the US.)

it isnt about revenge anyway, its about eliminating extremists and their safe havens. While Im sure there is plenty of reason to criticize US foreign policy, both political and economic, a lot of the so called 'causes' stem from the Islamic world itself. Some of these guys actually believe they caused the USSR to collapse, and want Islam to spread across the world. Some of BIn Ladens rhetoric 'references to Andalusia etc' puzzled a lot of people in the west. (he was talking about the loss of Islamic Spain back in the 15th century) these guys talk about a 14 hundred year struggle. theyre nuts!

the fact is that it wasnt just the US that was attacked, it was the West. (they needed a target, regardless of all the talk about US policy.

why didnt they attack the house of Saud, (after all they complain about undemocratic regimes) Because the US is a better target propaganda wise. Of course they didnt have a problem with the Taliban regime.

heres a couple interesting viewpoints.

http://www.janes.com/security/international_security/news/jdw/jdw020911_1_n.shtml