There are very real, very serious uses in home defense for an AR that booze is dismissing offhand.
I understand his point of “make them harder to get at least,” but at the end of the day I don’t think that would make much of a difference, or, conversely, you’d have to be over-correcting and creating a process so onerous that it denies way too many people their due process rights to weed out the few bad guys.
Im not dismissing out of hand such a solution, but it is easy to say “just make them harder to get,” but it’s quite difficult to come up with what such a law will look like without infringing on people’s constitutional rights.