The steel structure, aluminum sideing, etc would not have to get the the point of melting red hot and glowing. As the temperature of the steel increases, its strength continues to decrease until it collapses, which I would think is well below of the temperature of it starting to glow and warp. I also assume that you are a materials or structural engineer and don't really know the thermal dynamics that were occuring in the building at the time.
The steel in only a small area would have to lose its integraty to start the domino effect of bringing all of the floors down, you would not have to see on the outside of the building massive warping and melting of the aluminum.
What stikes me that you jump from the observation that outside aluminum is not melted to the premise that the government set up the whole thing. Combine this with the fact that the WTC was attacked a few years earlier and that it was fully understood that islamic militants planned and carried out the whole attack.
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