You act like this happens every day in the US. It's still a rare occurrence here as well. If someone wants to do this in Canada I'm sure they will. You have weird gay porn stars killing their partners and taping themselves beating off with body parts. You also have people playing samurai on buses. You have the same amount of maniacs that we do. A maniac is a maniac. Period.
People outside of the US take what they see in the media and make assumptions on what life here is like.
I live in a small town that is completely safe. Sure, we have our random idiots breaking into cars or whatnot, but I couldn't tell you the last time this town had a homicide.
I'm going with my wife tonight to see TDKR (my 7-year-old, 5-year-old and 2-year-old will remain at home with a sitter) and have zero fear of a shooting at the theater.
These wack-yards are a world-wide disease. People need to get their blinders off realize their security bubble is just as safe as mine is.