I kind of agree, BUT...

The proportion of human adults who meet this level of "responsible" is probably no more than about 60%, and this is incompatible with our current system of allowing gun ownership by default to virtually all adults except convicted felons. I should not be allowed to walk into a store and buy a gun solely by virtue of how long it's been since I came out of my mother's vagina. The absolute lowest bar possible would be to require me to have at least taken some sort of half-assed safety course, like you do for cars or boats or even for a hunting license.

And, of course, here in PA we regulate the sale of NON-ALCOHOLIC BEER more heavily than we do the sale of ammunition.