I think it's well within the realm of possibility that the U.S. spent some number of trillions (I've heard from one to four) of dollars of taxpayer money to attempt to initiate the Biblical apocalypse and the second coming of Christ. Since WWII every major military event or war has been seen by that crowd as a sign that "it is the hour of the time," 9/11 certainly included. The fact that it happened right about at the millennium added even more fuel to the fire.
Throughout history leaders have often squandered the wealth of their kingdoms on crazy religious crusades, and being either rich or politically powerful does not exclude one from believing in things that are completely bat-guano insane.
It's one of the only explanations for Iraq that really makes sense to me. Iraq had nothing to do with 9/11 and it would have been far cheaper to develop better oil drilling technology here at home than to invade for oil. The war cost more than developing the entire Bakken play. It would also have been cheaper and ultimately more effective to deploy a missile defense shield and better border screening for hazardous materials if we were really concerned about WMDs. For a trillion dollars we could likely field Reagan's Star Wars dream complete with a staffed orbital space laser command.