Since when does a skyscraper collapse from fire?
A hot enough fire weakens metal. Jet fuel, diesel or heating oil burn very hot. If there is enough fuel to burn for an extended period of time things happen.
What caused the twin towers to collapse? It wasn't the direct hit from the airplanes or the weight of the airplanes on the structure. Without the extended fire from the jet fuel the buildings wouldn't have collapsed.
If you have an extended hot fire at the base of a building it will also cause a structural failure and then there is nothing to hold the building up.
The buildings that collapsed experienced very unique and unusual circumstances.
That and the structural beams that hold the towers up were all cut to a Tee of 45 degrees that people can all see pics of. The only way this happens is if it was pre cut and fabricated and makes sense that a single fire can knock such a big building down in one swoop without affecting the others.
How about the insurance stocks that secretly shot up with big orders the days leading up to it? Whats this I hear that Bush's relatives or he was the head of the security servailance team or something leading up to the attack... too many things to obvious that it was coordinated to invade another country for its resources.