A gun might be a tool but it's a tool designed purely to kill. It has no other practical use.
I agree with your points about gun ownership and crime in the UK Doug.......but as for guns having no other use......shotguns and rifles have very vaild uses on farms in the UK, and as sporting tools they were just as valid as bows in archery, javelins in athletics, and shotguns in clay pigeon shooting.
The original design and development may have been as a tool to kill, but this was true for all of these examples, it doesn't denigrate their application in sporting events.
My parents did own guns, as part of their sport of target shooting. The change in the British gun ownership laws simply removed all the legally held and controlled pistols used in sport.......the effect on crime, unsurprisingly, was negligible.
Still, the notion of guns for personal protection worries me........it's just a case of upping the ante. I'm against the arming of the British police. Armed response units work perfectly well, and while we may need more of them, they're a preferable alternative to arming every Police officer.