An accident prone person won't manage to shoot themselves, without a gun though, will they? and the number includes children - known to be quite accident prone, generally parents try to protect them from that.
Crimes of passion are just that - in the heat of the moment. The longer people have to cool down, the less the chance of violence there is. If they have to run to the knife drawer, find a knife and chase down their victim, that victim has a higher chance of a) escaping and b) surviving. If they have a gun in a holster it's just "Bang" and you're dead.
Getting to the root cause of violence in our society would be great, in addition to the legal control of guns, so they don't get into the wrong hands.
So perhaps you could start by not condoning attacking, or even killing people for nicking your property, eh?