In addition to what some other people said, the school wasn't even open.

Their website had frequent updates for years but then went dark for multiple years until right before the fake shooting. Then, in the police camera footage (which was 90% redacted and was uploaded in a lossless file format which made it multiple terabytes which was storage that most people didn't have at the time) shows further evidence that it wasn't in operation at all.

There's evidence from the little we can see of the inside of the school, which shows that there's mold all over the place, exposed wiring, water damage, all things that would get the school fined or shut down for not being up to code. There's no toilet paper in any of the bathrooms either.

The classrooms were set up like a movie set. The shooting supposedly happened during class time, yet there's no textbooks, worksheets, pencils, etc on any of the desks. There's no backpacks anywhere, and all of the chairs are neatly pushed in to the desks despite the fact that there was supposedly a shooting happening, and the fact that we're supposedly dealing with elementary schoolers and there's no way they would all have pushed all their chairs in.

Then there's the aerial footage of allegedly concerned parents walking around the school, except you can follow their locations and actions throughout the footage and see that they move like NPCs (aka they're actors) that continually walk in the exact same paths and have the same brief fake conversations with the same people over and over, Like, there's a guy you can track that talks to someone for a few moments, then goes into the building, comes out the other side, walks back to his previous position and talks to the exact same person at the exact same spot, and then goes back into the building and does it all over again.

There's tons more shit, but it's blatantly obvious that the entire thing was a fabrication from beginning to end. It never happened. NOBODY died at Sandy Hook.