It's also a fact that only 3 steel buildings have ever in history collapsed due to fire. These were all on 9/11.
Ajnd that's a load of rubbish.
Steel buildings collapse all the time due to fire - most warehouses (even multi floor ones) are steel framed these days as it's cheap and fast, and when they catch fire they often collapse just from the fire, let alone the damage of an aircraft hitting them, and the sort of weight above the damage that the towers had.
The reason you don't see it very often with sky scrapers is fairly simple, AFAIK no other skyscrapers have been hit with a hundred+ ton aircraft that has spilled hundreds (thousands?) of litres of aviation fuel all over the inside of the building, whilst at the same time knocking out most of the buildings fire fighting gear.
Basically the two towers were at the same sort of level of fire prevention that used to be common a hundred+ years ago, when buildings much smaller did burn down with depressing regularity, and those were from fires started by things like candles and oil lamps at a fairly low level, not on the 60th+ floor after pumping equipment, pipework for the sprinklers and water storage tanks were damaged.
You cannot seriously say "no other buildings have..." when there hasn't been the same circumstances (and especially when other buildings with a steel frame have...although as i've said before the towers were iirc a different design to what came before, and most of what came after in how exactly they were designed to handle stresses, as they were built based on lessons from older buildings, and newer ones in turn learned from them).