I have watched a good bit of it it, and I have read about it and I don't think it was faked. The reason, well the government, both Dems and Repubs are are too thick to manage to do even the most simple tasks let alone pull off something like this or 9/11. Are they shady, yeah but can they manage this no. There are way too many players in the game beyond the children, parents, etc. You have an entire town that needs to be on board, family from across the nation/world, you need to president to be a good actor to shed the alligator tears, convince reporters to go along with everything or fool the reports, etc. This isn't the government hitting one or two children or people to prove a point, something this massive in scale would be impossible to fake.
I would more likely believe that the Government brainwashed the dude into shooting up the school before believing that it was staged.