What if none act? After all, none of the police did and they were supposed to be trained to the hilt. You're expecting a lot from a group of people with minimal training, to react in a manner where professionals don't. In 2019 a gunman shot up a Walmart and killed 22. There were likely a hundred or more people in the store and, it being Texas, the odds are some were armed. Nobody ran towards the gunman then, but you expect teachers to do that first time, every time in the future?
So I guess just don’t try it. At all. Seems the schools that do allow it don’t have problems like this. I am for having armed guards at schools. Start working on mental health problems. Many of these shooters have mental health problems and many times have been on FBI list. Listen to the children when they report troubled children within that school. Push for the children in school to say something if they see or notice something. Make sure they stay anonymous..
What if they do? It seems that these mass killers look for soft zones… no gun zones…..perhaps just knowing there are guns in the facility, killers will not attack. The data points to this. In my opinion a teacher who volunteers to carry a gun has made a serious decision about protecting the students there. It’s a sad commentary that i expect a teacher to be more aggressive than the “professional” but time is of the essence and red tape and confusion cost lives. Teachers are in the building already. They have the best chance at intervening imho.