There's a couple much more evident conspiracies if you don't get lost in the spectacle of 9-11:
The Taliban would have given Osama bin Laden up without a war. The US would just have had to play the diplomatic game and have let the regime save a little face. GIVE US - NO TALKY NOT FAST ENOUGH - BOMB was the US response though. The US wanted war, not to catch the "mastermind."
The Iraq war, for the boners that the administration had for it, was stupidly planned and executed. They didn't get the narrative straight beforehand, so they failed on the front of providing moral force - basically ignoring everything that was written on war, ever. They got caught in stupid, blatant lies. And they could have forced Saddam into exile without invading - but once again, the administration was hell-bent on war.