The "use" and "need" for firearms in Canada is exactly the same as in the US. Self defense and sustenance hunting. That part doesn't change. The difference is whether that's legal in Canada or not. And if you are willing to break Canadian laws during a disaster situation to protect and/or feed yourself, or would be willing to settle for different results than you might get without a firearm. You may be willing to settle for different results because you don't think the likelyhood of the original event is high. Maybe assaults in Canada are so low that it becomes irrelevent to own a firearm for self defense. That is your call.