The problem with the suggestion that principals and teachers start carrying in school is that teachers are a largely a bunch of nutso lefties who hate guns and wouldn’t pull the trigger if their own life depended on it.
Great idea, but I’m skeptical it would ever be implemented.
Depends largely on the school.
It would be pointless to authorize principals and teachers in urban schools. There's a high risk that the guns wend up in the wrong hands (the students').
Similarly, suburban schools -- which are largely populated by the sort you describe.
Rural schools? No problem. The administration, teachers and students all know what guns are for...and how to use them.
I’d suggest placing retired cops and military men in the schools with AR-15’s or something similar. Pay them a small stipend.
We have volunteer firemen all over this country because not all people would run into a burning building to put it out - nor are they equipped or trained to do so.
How about volunteer parents, grandparents, ex-police, ex-military, or CCW holders who are vetted, trained, and willing to provide immediate deterrence and protection while the school is in session?
They don't have to teach or even interact with students. Their only purpose is to deter and prevent murder and mayhem until the police arrive 10-20 minutes later. Their responsibility is be on site and immediately available with communications and weapons, perhaps under the direct supervision of an off duty or retired policeman. Volunteers can work in shifts and are not "full time". Then you have on site defense in depth.
By the way, this is a similar model to that which prevented the massacre in the Colorado Springs church shooting a few years ago.