I don't support Osama bin Laden but I doubt he did 9/11. It's a well-known fact who did it and I already mentioned who it was. The Taliban were right not to hand him over. Bush didn't provide proof that Osama was guilty of the attack and there is no proof that he was involved.
That being said, I want to mention I don't know much about Osama bin Laden and I don't know if he was a CIA agent or whatever. Not all of the videos allegedly of him are actually the same person. So I have no idea what really was going on with him. Was he a CIA agent? When did he die? Did he die, etc. But it's been confirmed it was the Zionist occupation state behind the 9/11 attacks.
"Osama Bin Laden" died during the initial invasion of Afghanistan, late 2001 or early 2002. For a few years there, everyone kinda knew he was dead and even talked about it a bit. For example, when John Kerry criticised Bush for letting bin laden escape during the 2004 presidential debates, conservative commentators leapt to Bush's defence by pointing out that everyone knew he was dead.
Then, shortly thereafter, an extremely blurry tape of Osama was shown on American television. The tape was a crude hoax, as was obvious despite the high level of downsampling applied to the tape in order to conceal its inauthenticity, but since nobody's allowed to say that something shown on television is a complete hoax (because the government and mass media never, ever lie — ever, especially related to the glorious war on terror), everyone had to go back to pretending that Osama is in fact still alive.
Since that incident, however, we have not been treated to any such fake videos of Osama bin Laden. Most of the evidence of his continued existence has consisted of fake audio tapes, fake correspondence, and recycled authentic footage of bin laden from pre-2002. We have pictures of Che Guevara dead, we have a video of the hanging of Saddam Hussein, we have picture of the dead sons of Saddam Hussein. There was no problem to display them worldwide for the edification of the masses. Where are the pictures of bin laden dead? Nowhere. Or only fake ones.