OK, the knife was just an example.. the point is.. if somebody wanted to kill people, there are other ways to do it other than just guns... Knives are just one example, dude could build a bomb, anarchists cookbook shows you to make several...
It's not really about the weapon.. it's about the person with that weapon. I'm not sure how you deal with this. I guess things like this, it makes me realize how lucky i am to actually live in Canada but Canada has a bunch of crazy bastards too so really... I don't know what to say here.
It's just insane.