I think @
allegro called it out for what it is though.. it seems to me like a dick extension. Maybe you say to people who ask why this form of gun is showing up as so popular in mass shootings is because it's just big and scary looking. I'm equally scared of both of the guns in that picture you posted up there. I know they'll both kill the fuck out of me.
My brother is a libertarian, and he likes the guns a lot. I asked him about the AR-15, and why is it such a big deal. This is what he said.
The AR-15 is, in many shooter's opinions, the best (and consequently most popular) rifle design of all time. I'm pretty sure that the AR-15 is the most popular type of rifle sold in the United States today. So that's why they are so upset when outright bans come up. But here's the thing, the AR-15 isn't really much different than any other auto loader out there
Trust me, he's really into this shit. He thinks there's something super awesome about it that you're not owning up to. But he brings up the point that functionally it's not that different than other "auto loaders" out there. This is a class of gun.
I think you're making a straw man out of the "no more semi autos" stance with your comparison above, just like I think you're underselling the reason people fetishize the AR-15.