It do helps but if someone want to kill someone, really want, he'll do it.
Alright, directly about the school shooting thing. I live in montreal. For those who doesn't know doesn't know there has been 3 school Shootings in montreal since 1989.
Dec 6, 1989- Ecole polytechnique engineering school (14 women death, 14 injured; the guy was targeting women)
Aug. 24, 1992-Concordia university (4 slain professors, one injurded; the shooter was also a teacher here)
Sept 13, 2006- Dawson's College (1 killed; 19 injured)
The shooting at the polytechnique University set the ground for the gun control law that we currently have now. Some will say that it's not working, some will say that it's because of it that there's not more event like those. But for the case of the Dawson shooter, all his firearm were legally purchased and registered under the gun control law.
I remember perfectly well the Dawson shooting. I was still at work at an hospital and I was on a break outside near where the ambulance are parked. when it happened, I heard it on the cb radio they called in every ambulance on the spot saying that there was a shooting. only a couple of hours after that, I had to go to class, ConU is about 2 blocks away from Dawson, our student union were welcoming the dawson's student for counselling.