"The rules and purposes of debate are different than the rules and purposes of higher academia."

That statement reveals so much about a person's character and behaviour in threads such as these...

"why didn't those top portions arrive at the bottom relatively intact?"

Because the energy they possessed when they hit the ground went into reducing them to rubble (1/2 m v ² )


"And how does this explain building 7?"

If you had big heavy lumps fall on you, you might fall down too...