Well I think we can all agree that declaring Schools gun free zones hasn't worked out so well.

Having one SRO on a 45 acre campus with >3000 students ..... didn't keep those students safe.

Here in the Burbs of the Burgh we had a student stab 21 students and facility a couple of years ago... a student at Ohio State (IIRC) drove his car into a group of students..... didn't some guy attack 4 cops in NY with an hatchet?? ..... so "guns" are not the problem just one of many tools that can be used.