“Proof positive the truthers were wrong.”
Oh, no doubt. If you walk into a high rise building, built in the last 75 years, it will have fireproofing - stuff sprayed onto the steel members.
Its not a big secret that heat and steel don’t mix, and fireproofing has been embedded into building codes for a very long time.
But the Truther argument is a classic strawman argument:
“There is no way fire melted steel”.
Well, they are right. And just like that, they’ve put the opposition in the impossible position of defending the notion that common fire melts steel....melted, as in changed to a liquid state.
While it is possible that deep in the pile of rubble, the weeks long fires did melt some of the steel, that was not the cause of the collapse. Rather, heat weakens steel, columns buckle, and beams sag....and buildings go down.
It’s also undoubtedly true that the act of hitting the ground with stories of concrete and steel above melted some of the steel from friction.