Next thing you know, the police gets a report of a firearm-related incident at a school. The report says that someone with a gun went back into the school. So what do they do?
They go in full force: bullet-proof vests, automatic weapons, they kick out everyone and search the school room-by-room. Action first, explanations later.
What do the teacher do? They complain.
If you want to discuss everything before something happens, you shouldn't complain if shit goes down. If you want the police to take action, you shut up and comply when the police arrives and shoves you out of the door.