Well, I'm far from being any kind of leftie, yet I certainly do believe that guns, outwith the home, are a menace to any society.
Nobody ever seems to offer a sound reason why confining the use of anything not a sporting rifle to the home is not a sensible idea. A sporting rifle or shotgun has some legitimacy out in the sticks, but not that I can see, in the city.
If it's supposed to offer the possibility of defence against somebody already with a gun in his hand, then you would need to be a Hollywood hero to get your own weapon out quicker than he can pull the trigger. Yes, I do have a trace of a memory of somebody going back to get a weapon from his car and shooting some dickhead who had attacked a church or some other building.
However, if the fuzz arrives as you are standing there, gun in hand, it's just as likely that you will end up in a drawer in the morgue too, don't you think? As for the scenario that would play where several "good guys" are armed and on the scene, unless they know one another, the situation would become an even more interesting one very quickly.
Neither do I agree with the poster who wrote that some simply want to end gun ownership for "political reasons"; no, I believe the desire is for survival reasons, and has zero to do with politics. Oh yeah, politicos latch onto it and the money rolls in, but that's not to say that the civilians all see it as politics at all. A friggin' gun kills without political discrimination, the perfectly impartial executioner, you might say.