1. Mr. Bruce, you may as well want to start accepting irrefutable, scientific evidence - 9/11 is a controlled demolition, an inside job, false flag military operation type of Reichstag fire, Gulf of Tonkin, Pearl Harbor.
This per incontrovertible, conclusive scientific evidence, and also per common sense.
Nanothermite high military explosive was found per tons in the dust of pulverized WTC towers, when they exploded, imploded and turned into pyroclastic cloud.
Utterly impossible other than as unconventional masterpiece controlled demolition.
To your questions. How come so many people participated, and are remaining silent? First, not too many participated, second, those who did, didn't know what they were doing.
For example, painting nanothermite on the walls, upgrading fireproofing, rewiring the towers during several complete buildings power-downs.
Main thing here is-it has been done. How, that is a matter of new independent inivestiation.
What's with 9/11 conspiracy theorists?
