Twin Towers: conspiracy or not?

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The 9/11/2007 was the most sad day for the world, but specially for americans, they never beleaved that 2 of the most famous buildings were burning, and a lot of people dying. In your opinion was it a conspiracy? There are many proofs that make me thing about it, but an only reason: petroleum. Can a president make this to his own country? Here are some videos about the proofs: http://it.youtube.com/watch?v=h7cvjBViV7g&feature=related http://it.youtube.com/watch?v=lv2ck2qsiGA&feature=related