I never implied it would be a bloodbath but nice try. My main concern is if something went down with a shooter on campus, everyone is armed and you cannot tell who the aggressor is. So now you have a school in chaos with multiple people armed all scared and confused with their finger on a trigger.
But at the same time the already low chances of a mass shooting are lowered even more if the shooter knows everyone is strapped so we'll see how it plays out. I really hope nothing like what I described ever happens.