Only one thing is predictable with statistical certainty. If there are more guns in the schools, streets, offices, military bases, and homes. more of them will be fired and more people will be killed.
If we arm all the teachers and security guards, the most likely school mass murderers will be teachers or guards who flip out and turn their guns in the wrong direction.This is not a case where we can fight fire with more fire.
What does our favorite math guru have to say about that, I wonder? It seems pretty simple and straightforward to me.