I keep holding Israel up as a great success in preventing school attacks since 1974. Weer’d World linked a great video by a fellow in Israel explaining their security system. Further, they show how armed Israeli citizens protect their children and each other on a routine basis.
Remember, in Israel, teachers as well as other civilians are always armed. Folks like Bloomberg, Obama, and Biden who say that won’t work are simply lying. It works perfectly, as demonstrated in Israel. I’ve seen it for myself first-hand. Rather than take away citizen’s freedoms, Israel leveraged their citizenry’s self-reliance, something we used to understand in this country.