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Just an idea... what if the buildings <B>were</B> wired with explosives? The WTC had already been attacked once, so they knew that terrorists were interested in it. And the most obvious goal of attacking such large buildings would be to topple them. Maybe the explosives were planted as an emergency last resort, in the event that the buildings were fatally damaged. Bring them down cleanly, rather than let them topple and destroy the surrounding area as well.
Think about it, the buildings have been severely damaged, and collapse is imminent. Is it better just to let them topple, destroying surrounding buildings and killing potentially thousands more, or do you drop them straight down, sparing the surrounding area? The people trapped inside are just as dead either way, better not to endanger that many more people.
As for WTC 7, I assume that seven hours later the building was empty. Why risk the lives of more firefighters to save an empty building, when the rest of the complex has already been destroyed? Drop it in a controlled fashion, "pull it" so to speak, and be done with it.
You can appreciate why this would be a secret. People would be uneasy in a building they knew was wired with explosives. Keeping them secret would also minimize the security risk of having the explosives in the first place. Finally, explaining the decision to use them to the general public would be a PR nightmare. It's the least bad choice in an ugly situation, but making people understand that would be virtually impossible.
I'm not saying I even believe this, but I can definitely see how it could happen.
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