steel can be weakened by fire, however it cannot be melted to a molten state (even with the addition of jet fuel). Fireproofing adds time / protection to the steel, from the fire. There is nothing that I can think of in a regular carbon fire that would burn hotter than jet fuel. Im not sure if your comment was for or against the "sold story" the feds gave us, so Im just answering to the best of my ability!
“Let it not be said that no one cared, that no one objected once it’s realized that our liberties and wealth are in jeopardy.”
- Ron Paul