No one is saying nano thermite brought the buildings down by themselves. In fact beams that were "cut" by thermitic material were found and exposed and that may have been it's sole use in the destruction of the buildings. My cousin worked in one of the towers. She told me workmen were coming in and out of the building for months before the event. She never asked what they were doing there, nobody did. She never trusted management after the first attack on the towers. They said over loudspeakers for everyone to remain where they were, everything was under control. She got up and left right after the first tower was "hit" (she didn't see any planes but she heard explosions). She was one of the lucky ones, she got out of the building before it too was demolished.