Obviously the planes got destroyed, I’m not saying the planes cut the towers in half.
Regardless - 300,000lbs of ANYTHING smashing into a structure at 500mph is going to compromise structural integrity to a massive degree. A steel tower isn’t designed to withstand those kinds of lateral forces.
These buildings were specifically designed to withstand the impact of a Boeing 707 which has a maximum takeoff weight of 330,000 pounds, which is actually higher that the 767-200. These buildings were designed to take the impact of a plane the size of the 767.
Compromised structural elements weakened by a fire (750F fire will ruin the heat treatment and soften the steel) and its pretty easy to imagine how the plane collisions could cause the collapse of those towers
None of the structural elements of this building were heat treated. Heat treating is expensive and can result in a brittle material. The chemical properties of the steel give it it's strength along with the rolling and forming processes when manufacturing. You can put a cast iron pan in a hot oven and it doesn't weaken it.
All of the exterior columns on these buildings on the floor that was hit used .375" thick steel and the fuselage of the 767 uses .063" Aluminum.