Apparently some people have forgotten about metal detectors as a way to keep metal things like guns or knives out of schools. That's much better than more bullets flying around in there if you ask me. I bet the technology exists to integrate the metal detector to the door locks to keep the threat outside the building.
Once a potential threat is contained outside a building, Cadet Bone Spurs could be called in to handle things. He said he'd charge right in even if he wasn't armed with any kind of weapon--so let him do it.
It looks like politicians who resist any kind of restrictions on firearms sales might be getting a commission on every sale from the NRA, who is pulling their strings. If the NRA is pulling somebody's strings, it's time to throw them out.