How important is Cheney's admission?
Well, 5 hours after the 9/11 attacks, Donald Rumsfeld said "my interest is to hit Saddam".
He also said "Go massive . . . Sweep it all up. Things related and not."
And at 2:40 p.m. on September 11th, in a memorandum of discussions between top administration officials, several lines below the statement "judge whether good enough [to] hit S.H. [that is, Saddam Hussein] at same time", is the statement "Hard to get a good case." In other words, top officials knew that there wasn't a good case that Hussein was behind 9/11, but they wanted to use the 9/11 attacks as an excuse to justify war with Iraq anyway.