How could it NOT have been the government? It would take some major pull from private corporations to have NORAD stand down, or the Pentagon open up their airspace to unauthorized aircraft, both of which happened on 9/11. Or have the scenes cleaned up so quickly and efficiently. Or just how the investigation into 9/11 occurred, with the government constantly stonewalling it, Bush and Cheney not willing to answer questions, and definitely not under oath, etc.
Or do you remember how the propaganda machine was in full tilt after 9/11? They went into Afghanistan, which was fine and dandy, then just an avalanche of pure propaganda came in regarding Iraq. It was obvious too, hence why it sparked the largest coordinated worldwide protests ever seen by man before. Remember that? The propaganda was so obvious, almost every major city in the world coordinated together to have protests on the same day against an invasion of Iraq.
Then I remember during the beginning of the Iraq invasion, all of a sudden loads of news reports started coming out about how Syria and Egypt were terrorist havens, and need to be dealt with. Once Iraq went to hell though, those news reports magically halted, and we were never bothered with Syria or Egypt again (until the Arab Spring, of course).
