I understand Switzerland trains an adult and issues a gun to most households. They have the lowest gun crime rate of any civilized country.
Police cannot be everywhere and can only investigate most crimes.
The way things are going, we need to train and arm adults responsible for others and money and give them permission to protect us.
If the teachers had been trained and armed in the schools or anyplace a crime might be committed, that would be instant crime prevention. If the criminal knew we were armed and trained they probably would not even come in to commit a crime. We might even be able to get rid of some criminals.