Reasonable people will make their own assessment. The back of that building was perfectly undamaged. The front had small damage. It turns into powder.
Powder.
The building pulverizes itself because of a gash in the front. It converts all it's concrete to powder, and all its metal into the molten steel puddle in its basement.
It's your right as an American to believe this. it's my right to believe that story is completely rediculous. With time, perhaps one of us will be proven correct. peace!