I’ve heard some crazy explanations about the physics of the attack. Someone said it was unheard of that fire could melt steel. Not a blacksmith, obviously. One of the videos said the plane’s aluminum couldn’t pierce the concrete and steel building. Aluminum’s selling point has long been that, pound for pound, it’s stronger than steel; obviously the narrator has never seen straws and such embedded in telephone poles and trees after a tornado or hurricane.
As for the controlled demolition, it’s not hard to imagine the weight of the intact floors above the floor that is weakening due to heat, dropping one floor at a time as each one fails, to resemble controlled demolition.