Stop mass murders and killings in schools (or at least make a real attempt to)

Look, here's a very simple yet effective proposed solution; let the teachers carry weapons. not one, (because what if that ONE goes crazy) but a few, add a cop (with a gun) at the door and assign two security guards to watch the cameras at every school. because the simple fact of the matter is this, no matter how hard you try to ban guns, people (not necessarily just criminals even law abiding citizens that go crazy) will still get them. No matter how hard you try to control who owns guns, You can't control crazy. and you sure as heck can't control stupidity. let the teachers carry, train them in minor anti terrorism tactics, and at least the majority of these kids would still be alive. this is tragic, but what's even more tragic is we aren't doing anything to stop it. this has got to stop