Apparently the writer didn't want to have the job to do some research and interview survivors, so he decided to create a nonsense fiction story. The thing that bugs me is that, there's at least one survivor that I know of, with an unbelievable story and he still leaves on the witness protection program, so, that could've become a mini series on itself, but unfortunately the writer decided to take the easy way out.
The only reality in this show is the shooting, apart from that is all fabricated, so I believe you'll see about 5 minutes of something thar happened that day.
The show's ambientation is terrible. It's supposed to be 1993, but you'll see cars from 2 years ago. As far as I remember there are only two cars from that period in the 4 episodes.
The only thing that works here is the a great acting. We have some amazing actors that can make entertained enough to kinda forget about all that terrible production and writing decisions.