The 9/11 truth movement. Why has the government not commented on these allegations? How can they ignore This?!

You have this Bold 9/11 Truth movement with actual testomonies and supporters and "evidence" who make such claims as That Bush Knew of the attacks before they happned, That theres no way that thease planes could of taken down the towers w/o other sabatage at large, wheres the missing Gold?, Was the pennsilvenia plane broght down or shot down? Why was all the footage from the pentegon crash confined? Why was there no evidence of a plane at all found in the wreckage at the pentegon? Thease questions and loose ends go on and on... and Our goverment has yet to comment, has yet to shoot down thease allegations, they only action that was chosen was to choose to pretend that there is no such allegations and hope they go away. It gives the impersonation of guilt, and raises even the most sceptical's eyebrow. The only replays I've seem have been of The towers repeaditly in what now seems is in order stimulate anger and sympathy to stimulate support for W's war.. Why has this been ignored?