There's no point in arguing with conspiracy theorists. Any proof you offer is simply seen as part of the vast coverup. A liberal told me that no one was on any of the 9/11 planes. When I asked what happened to the people she simply started off on a rant about secret FEMA death camps.
FEMA death camps? That's a new one on me. Personally, I only knew about the ones run by the Department of Agriculture.