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The buildings were built to withstand airplanes crashing into them. ....
It makes no difference that you say this. What happened is what happened.
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The heat was far from sufficient to take the towers down.

A hope of yours, but not a proof. The proof says the opposite, as I have shown you previously. I do not even have to recalculate it, just pull the prior numbers.
Believing something does not make it real.