Baldwin’s stunt double accidentally discharged a live round under very similar conditions to the lethal event shortly before the fatal accident. Crew members had lodged formal complaints to the Production Manager and many left in protest when these issues were not addressed because it being a non union show there was no other authority to appeal to for better safety standards. The number of armourers they had was not nearly enough for the volume of the show. It not just that they hired crappy ones that violated every common sense rule that exists in the wider body of film. This was a firestorm of factors.
A lot of the issues are that people do not understand film structure, safety culture and just how regimented things are when done properly. The burden of context required is high and the structure of productions as temporary entities makes it really hard to prosecute and honestly if we weren’t dealing with a face people know this would be easier. The fact he was literally holding the smoking gun means you have two separate but related culpabilities.
People have been charged in film for these incidents in the past. The fact the prosecution didn’t adhere to proper process does mean there should be a redo… But to dismiss it with prejudice sends a message to these indy films that playing with fire and ignoring flagrant safety violations that would have you instantly shut down on a union show is okay and that is unacceptable.