I don't even engage in the debate of WTC 7 collapse anymore.
Presenting the obvious truth to some people that the building was brought down by controlled demolition when they believe otherwise is akin to convincing someone the sky is blue when they believe otherwise.
No amount of evidence nor reason can be used with them
Yeah they ignore the obvious that something other then hydrocarbon fires had to be present to produce the molten metal under all 3 buildings. They insist that the fires were hot and intense enough to weaken all the major support columns at the same time to produce a 2.25 sec. free fall collapse but ignore the the molten metal. They also ignore the outward explosive ejections of material, and the fact that the buildings fell down in such a uniform manner, that contradicts the sporadic damage.
Independent scientist using advanced techniques led to the discovery of nano thermite particles in the WTC dust, they also found iron, sulfur, manganese which is characteristic of a variation of thermite which is used to cut through steel which is called thermate.
Thermite incendiary cutter charges do in fact exist, and are what is speculated to have caused the extreme heat that produced the molten metal that lasted for 3 months under the rubble, despite the attempts to extinguish it, even using a chemical known as Pyrocool.
There is solid physical evidence that points to thermitic reactions at the WTC. The video evidence of a thermitic action dripping from the S tower, and the underground fires, as well as the iron spheres that scientists have found, as well as the evidence of it in the dust.
[ame=http://www.youtube.com/watch?v=RAk3u4i_zkg&feature=player_embedded]YouTube - Debunking 9/11 Debunking: Controlled Demolition IS Possible[/ame]
Anyone who insist that thermitic cutting charges are not reliable or insist that the possibility of them being used is remote, doesn't know about it or is lying.
Thermite self-consuming cutter charge casings have been around since first patented back in 1984.