In regards to 9/11, IF the U.S government did it (and mind you, that's a lot to swallow to think they would ravage their own people to go to war to get oil) then it was all cuz of Dick Cheney.
Saddam Hussein dropped chemical weapons on his own people that compromised his own interests, what's to stop a couple dickheads in our government getting super secretive and doing something along the same vein? I bet, if it DID happen, it was a deep cover incident, where 99.9% of the government didn't know about it, and just a couple dickheads at the top secretly conspired with Bin-Laden (who, mind you, had deep roots with the U.S. government having been trained by them) and crafted a whole plot to make this happen. Based on human behavior, I would be more interested in piecing the alleged conspiracy together in this fashion than arguing jet fuel and steel beams. But Dick Cheney. I'm telling you. I never trusted that dude.
Just playing Devil's Advocate. Not saying I firmly believe it was a conspiracy, but if it was, this was the blueprint.