From what I hear Toronto actually has some serious crime... Drug dealing, biker gangs. Explosions use to be quite frequent there at night clubs; though I heard that way back in the 90s when I was a kid watching late night programming, so I don't know how true it is. I do know that aside from the drug trade and biker gangs, there seems to be a lot of street fighting too.
I know there are a lot of places in British Columbia that aren't very safe too. How is Nelson? I remember talking to a guy there that apparently made his living growing pot and selling it to headshops. As far as BC goes I think the drug trade is probably pretty strong there considering what it is in Washington state... and really the whole west side of the U.S.
So yeah, I think I'm going to go with drug trade and organized crime. I mean, the biker wars were pretty bad up there, and drugs fueled that.