CIA director Leon Panetta told the New Yorker:
When you read behind it, it’s almost as if he’s wishing that this country would be attacked again, in order to make his point.
What should we make of all this?
Well, everyone knows that Cheney is ruthless:
Cheney is also the guy who:
For his entire career, he sought untrammeled power. The Bush presidency and 9/11 finally gave it to him . . . .
So Cheney had a lot of motivation to "accidentally" let 9/11 happen.
Cheney also knew 9/11 was going to happen. The government knew that terrorists could use planes as weapons -- and had even run its own drills of planes being used as weapons against the World Trade Center and other U.S. high-profile buildings, using REAL airplanes -- all before 9/11. Indeed, the government heard the 9/11 plans from the hijackers' own mouths before 9/11.
Indeed, Cheney was in charge of all counter-terrorism exercises, activities and responses on 9/11 (see this Department of State announcement; this CNN article; and this essay). So he was in a perfect position to "accidentally" let it happen.
"During the time that the airplane was coming into the Pentagon, there was a young man who would come in and say to the Vice President … the plane is 50 miles out…the plane is 30 miles out….and when it got down to the plane is 10 miles out, the young man also said to the vice president “do the orders still stand?” And the Vice President turned and whipped his neck around and said “Of course the orders still stand, have you heard anything to the contrary!?"
A retired 27-year CIA analyst who prepared and presented Presidential Daily Briefs and served as a high-level analyst for several presidents stated that the Pentagon is a heavily-defended building, with defensive weapons on the roof. This matches a Pentagon employee’s statement that she was told "you are now standing in one of the most secure building in all of the United States".
And a former air traffic controller, who knows the flight corridor which the two planes which hit the Twin Towers flew "like the back of my hand", and who handled two actual hijackings, says that that planes can be tracked on radar even when their transponders are turned off, and that Donald Rumsfeld and the Pentagon tracked three of the four flights from the point of their hijacking to hitting their targets (also, listen to this interview).