>>516258
>Should the line for maximum capacity for harm be drawn, and if so where?
Are we talking for possession or public use/carry?
I'd argue that the bar should be set a little higher for taking weapons out into the wider community - if only because I'm pretty sure that a few streloks would try to use an 81mm mortar for 'defensive' purposes if you gave them the chance.
Would it be more useful to think of it in terms of indiscriminate harm and discriminate harm? The standard for 'discriminate harm' being that the weapon, when reasonably used, is not likely to harm those other than the person causing you to fire in self defence.
Under that model it then becomes a question of accuracy, projectile energy/over-penetration, and the area affected. Pistols (even automatics), slug firing shotguns, and SMGs/carbines would be perfectly acceptable under that standard - as unless you were chucking grenades or waving the weapon around while mag-dumping and screaming "GET SOME!" it would not be likely that you would harm anyone other than the person who necessitated the defensive action.
You might even be able to sell it to the anti-fun crowd - as a way to legally limit the public to only approved 'safe' guns. Granted it's a long shot, but it couldn't hurt.