It's a fruitless argument at this point, and especially in this place. Gun manufacturers and their lobbyists are so firmly entrenched in the U.S., even if all gun manufacturing stopped today, we'd still be at near saturation levels for the rest of our little, American lives.
Our congress is very much in the pocket of the NRA, so no reasonable background check law will ever get through. A gun sold to an insane person or a criminal is still a sale. And the more guns that are sold to the 'bad guys,' the more guns we need in the hands of the good guys. More sales!
But then we Americans succumb to so much sales marketing, we're killing ourselves with food and alcohol too. We're suckers. I just can't imagine suckling at the teat of fear (they're coming for your guns!, you need to have a gun for protection wherever you go!) that the NRA presents, which of course spurs more gun sales. Continuing behavior that doesn't work, or especially is harmful, is the very definition of insanity.
The dream of our country being free of regular, often gun violence will never be realized (at least in our lifetimes).
It's a fruitless argument because half the victims in this case were killing using a knife.
