Criminals won't use guns in most cases if they know their victims don't either. Gun related crimes up here are quite rare and scoped to criminals that have an ax to grind with other criminals.

Well, In England, after they banned guns there was the case of some nutter who sliced up some people with a machete. If someone wants to commit murder, they don't need a gun to do it. However, using a knife or machete may make it a little more difficult because you have to get up close and personal with your victim and you might get blood on your shoes...