Creepy gov Propaganda put out that the Towers were "Empty" "Poorly made" "there was no core" , etc., type of stupid excuses as to why they turned to dust in just outside of 10 seconds, i.e. free fall speed in a vacuum. 
Part of how they do the scam?
Assume the buildings were taken down by the "planes" and the fires that erupted from the (missing) crash.?
Now explain what happened.

Towers weren't flimsy peeps