The number of illegal guns in circulation here is increasing rapidly every year

It may well be, Cap, but you've got to admit that if guns are practically all illegal it dissuades most people from carrying them around (and hence limits the opportunities for their use). A quick frisk - or even sharp eyes - and you're in big trouble. Only a particular type of person is likely to have a gun in that context, and the majority of us can suss the "type" and avoid their company. It also helps the police identify situations where an armed response may be appropriate.

That's got to help save lives. And does.