9/11 is definately not just a Terrorism incident. The terrorists was definately involved but maybe there was prior knowledge and the buildings were prepped to implode. Buildings that are so massive and made to stand so tall and mighty will not collapse at free-fall speed into neat little piles.

As for Building 7, its not even hit and it too collapse into a neat-little pile. It takes weeks of planning and explosives prep to 'pull' a building neatly into a pile, so no way it was done during 9/11 itself.

Also, a lot of reinforcements had a distinctive clean angular cut which is a signature of it being 'prepped' for demolition.

Just my thoughts. :)