If this was some big mass conspiracy, and the Bush administration really did cause the towers crashing down as you believe, then why the hell would they allow some guy who can't get his facts right (the creator of loose change) spill the beans? Surly if they were gonna kill 3000people or whatever it was, they'd not really give a damn about shutting some guy up trying to uncover everything?
Oh and the whole steel thing, the way you write it you seem to suggest that at 2999f the steel is completly solid and has 100% strength. Then suddenly it loses it all at 3000f, well just use logic, of course its going to be much weaker under 2000 degrees, it dosn't need to completly melt does it.
See
http://www.ccdominoes.com/lc/LooseChangeGuide.html for a complete rundown on everything.