Why would government fake 911?

I heard from people that the plane were hologram projections and the building had a special explosive called thermite in it at first I thought this was absolute bullshit at first but then I started to look at footage of it very closely and what I started to see was startling parts of the plane do disappear and reappear before impact as if it were a projection and the buildings do collapse as if demolished rather than crashed into I now believe until I can be proven otherwise that 911 was a lie my question is what the **** does the government have to gain from doing something so sick and twisted like this to it's own people I just do see the point!!!!?