I don't know what to believe either.  But I am keeping an open mind.  I think WTC7 is a much bigger question that the towers because they weren't hit by planes. I don't think there has been a really good explantion about WTC7.  Even the conspiracy-debunking Pop Mechanics guy has been caught saying stupid things that weaken his postion.  He thinks ALL building fall straight down.  BZZZZT!  /watch?v=cTakSyrx52A   But who knows?