True enough.
Do you have any comprehension of how much kinetic energy an airliner travelling at speed would have imparted as it hit? A bit of fire retardant foam sprayed onto the steel was never designed to withstand that sort of blast.
A rough calculation (100 tonnes moving at 330kts) gives an answer of about 1.5GJ. That's about 1/3 tonne of TNT exploding - that's a big bang