Whenever I've heard that failure of imagination on the part of the government made 9/11 possible, I think of Tom Clancy.

He imagined such a thing.

I was on a plane to the west coast in August 2001, reading a Tom Clancy novel, and my seatmate and I had a long discussion about his attack scenario on DC in "Debt of Honor."

I won't say exactly what it was in case someone here hasn't read it.