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Tenet -2 points ago +3 / -5

The OP is misleading you. You don't need to reach melting temperature to affect a steel structure - you can weaken the steel and produce strange unplanned loads at lower temperatures and cause failure cascades.

Here is the NIST story about WTC7: https://youtu.be/PK_iBYSqEsc

Myles Power made a video about WTC7: https://youtu.be/7PpsCCTMP8w

I don't endorse him on other topics, but this particular video is good.