Where is the evidence 911 was not a conspiracy?

Zietgeist is an awful movie, seriously they make up a lot of stuff in it...watch "Loose Change" for some real interesting hard facts...Conspiracy's only are real if you make them out to be...I've done some research myself and Ol' Bushie, I concluded, didn't have anything to do with 9-11, but I think he did little to prevent it with the knowledge that something was coming and was going to happen.