I have never heard anyone say fires brought down the buildings.
The official 9/11 story states the building fell after his by a massive planes. filled with fuel that drenched the buildings and further contributed to the collapse of already weakened steel. In other words total is greater than the sum of its parts.
There are several fallacies in the OP address, that however does disprove that 9/11 was not some sort of conspiracy.
Want DP delivered to your inbox daily? Subscribe here: