How can we believe the government about this? After all, wasn't Nixon in office then?
I've said this before, but I doubt conspiracy theories based on video evidence alone when there should be plenty of eyewitnesses. Large groups of people just can't keep secrets that well.
Take the supposed "controlled demolition" of World Trade Center 7. There's plenty of evidence that debunks that conspiracy theory online, so I won't go into it here. But the thing that made me doubt it was lack of any eyewitnesses to the planting of the explosives. There are a lot of people in a 50-story Manhattan office building. If you've ever seen how those demolition crews work, you know they don't just plant a few charges. They plant dozens of charges all through the building. If I was one of the office workers in WTC 7, I would have noticed guys planting dynamite and running detonation wires all over the place. I get engrossed in my work, but I think I would have noticed that. "Dude, what's up with all the dynamite? Did I miss a memo?"