@freemo But that was my point? Nobody's saying (well, I'm not) that gun violence is the only type that can be addressed through the legal system and all the others are just down to the perpetrator. For gun violence, knife violence, whatever, if there's a weapon involved you need both the weapon and the wielder. To address it you can/should always address both sides of that fact, surely?
And we do. I've never seen anyone say that you should address gun violence solely through gun laws, and I've never seen anyone say that you should treat knife violence solely as a problem with violent people.