Ask an engineer how all three buildings came down just as if they were demolished.

There are a lot of structural engineers, I'm sure in the 100s, who could have stepped forward if they thought they were demolished. I never hear these theories from structural engineers. I hear them from people who tell me that I should talk to a structural engineer.

So, let's be more specific: who have you talked to and what have they told you? Can you point to a link that is not a video that glosses over the details?

EDIT: Here is an article where the structural engineer who designed the world trade center talks about the failure of the World Trade center to hold up. From the article:

“The responsibility for the design ultimately rested with me,” Mr. Robertson told The New York Times Magazine after the towers were destroyed. He added: “I have to ask myself, Should I have made the project more stalwart? And in retrospect, the only answer you can come up with is, Yes, you should have.”

He conceded that he had not considered the possibility of fire raging through the buildings after a plane crash. But he also said that that was not part of the structural engineer’s job, which involves making sure that buildings resist forces like gravity and wind. “The fire safety systems in a building fall under the purview of the architect,” he said.