Barbarian observes:
Yep. And the point is, if we armed teachers, more students would be dead than if we didn't arm teachers. Accidental handgun deaths are much more common than deaths from school shootings. You're proposing a solution that is many times more dangerous than the hazard.
Accidental handgun deaths don't tend to happen to people who don't unholster their weapons.
True. But it still happens.
Teachers would be trained not to ever unholster their weapons in the presence of students unless there was a clear and present danger!
And TH noted that unless we spent a lot of time drilling in actual simualted circumstances, people would be very unlikely to respond properly in those one in a million circumstances where a gun might help. Meantime, the unfortunate accidents would indeed happen. It's a fact that they do.
Assessment of Risk was a job I did for years; I was certified to do it. It's very unwise to try to control a very unlikely risk with a more likely one.
Understand, I'm not calling for gun control. I agree with you that any responsible person should have access to guns if he or she so wishes.
I'm just pointing out the reality. The idea of having armed guards on campuses would be much less likely to lead to deaths, (and in that one in 29,000 cases where a shooter does attack a school, would be much more effective) but of course, you would get very little benefit for that greatly increased cost. Spending more money on security cameras, training teachers for emergency procedures, and so on, would be more effective and less costly.
Which is why it isn't done.