“In the USA, even kindergarteners know that, in the event of a shooting, they have to throw stuff at the shooter or even try to swarm him,”

Yeah, um ... no. That isn't what children in the U.S. are generally taught.

Part of the problem with the tragedy of our common mass shootings in schools is that our schools are becoming more and more negatively influenced by police culture. More and more schools have police officers permanently on duty, which is understandable when you think about trying to prevent shootings, but ...

A hugely negative side effect of that is that police are bringing their attitudes about people being criminals into the schools. Cop culture here in the United States is generally violent and generally corrupt. Police officers here generally treat people very badly, presuming that they're up to no good, presuming that they represent a threat to police officers.

YouTube is filled with videos, new ones coming out literally every day, of cops violently abusing people for minor traffic infractions or little more than general suspicion. This stuff doesn't make the news unless somebody is killed or almost killed, but it probably should make the news.

A significant but horrifying subset of these videos take place in schools, where uniformed school cops physically or verbally abuse students, treating them like criminals instead of like misbehaving children.

I think your example really shows how this can happen. The cop doing your training was predisposed to think of people as criminals, and he's teaching school staff to think of students as criminals.

Will this reduce the possibility of school shootings? That postive outcome seems unlikely. Treat students like the enemy, and they'll probably behave like the enemy.

Police culture is not the answer.