A vast majority of schools in America do not have armed security and the vast majority of school have never had a shooting on campus.
Armed policeman might discourage some attacks. Metal detectors might deter a few but both are expensive options. The only school shooting I have seen was a suicide where a kid brought his mothers pistol and offed himself between the gym and and my office. Metal detectors or police wouldnt have mattered because he was outside.
Theres no answer. Some guns should not be available. As long as we are a culture that glorifies guns we will have them. I dont think most people need them and the thought of a bunch of guys walking around armed all the time scares me. Except for Pecos.
I have found theres only two ways to go:
Living fast or dying slow.
I dont want to live forever.
But I will live while I'm here.