My fave is the "laws don't work" argument. If you ban heroin only criminals will have heroin. Duh, that's a truism. In fact, it's the damn point.
And then you catch some of those criminals and have a right to punish. Not my favorite set of laws but it makes the point.
Yes, laws do work. I try to avoid breaking them myself. And if my employer didn't drug test I'd be gobbling chewables right now, cuz they are legal here.
Anyway, if you restrict gun access, types, and places, mandate safety, background check for felons, etc, you will reduce the rate of death by gun.
It's a duh. If you reduce the speed limit you will reduce the deaths from speeding. Duh ditto.