Arm some teachers, but do a psych profile on them first. There’s teachers that aren’t stable.
Gun control won’t work, in part because there are other weapons that can be used, as evidenced by the events in china on the same day as this shooting where a Chinaman went nuts and stabbed 21 people.
I read once years ago about a Saudi who went off the deep end and killed something like 17 people on a city sidewalk in Saudi Arabia with a scimitar. When you are talking about attacking the unarmed, lots of things can cause massive damage.