Gun violence seems to bring out two kinds of fools.
One kind of fool are the people who use the opportunity to call for more gun control. I am one of those who don't really see any legitimate reason for a private citizen to own fire arms (yes, I'm aware of the 2nd Amendment - are you?), but gun control laws are at best a tool to keep guns out of the hands of sane people - most of whom don't own guns in the first place. As long as people make and sell guns and ammunition someone who wants to badly enough will be able to get his hands on the means to kill a bunch of people for no apparent reason.
Of course, the other kind of fool are the people who use the opportunity to argue about how much better things would have gone if there had been more people in the crowd packing heat. "If armed students had been there, then Gill (the shooter at Dawson College) would not have been able to injure or kill so many people."
Yup, I can just see it. In response to Gill's first few shots, armed students in the vicinity draw their trusty "equalizers" and start blasting away in Gill's general direction. The results would make the evening news a lot more interesting.