I meant "don't need and shouldn't" as two distinct statements, not "don't need and thus shouldn't". I don't believe the average citizen needs a powerful weapon, and I also think they shouldn't, because as far as I'm concerned, the risks outweigh the benefits. I would argue the point of guns being "more than just defensive things these days" is exactly the problem. When the idea behind guns were just self-defence, sure, maybe that would work, but I struggle to see the reasoning behind having more powerful guns when you can defend yourself just as easily with a baseline one.
Maybe most people who buy guns are doing it legally and are informed, but a trend I've noticed lately is every time there's a mass shooting, gun sales spike. If I were prone to conspiracy theories I'd wonder about how the NRA and the gun industry profit every time a mass shooting happens, but that would be a stretch.
Look, I'm not completely anti-gun. I don't have a problem with people legally owning personal, concealable fire arms if it makes them feel better, stored safely, with proper background checks, mandatory training and keeping ammunition and the gun separate and locked up. But that increasingly doesn't seem to be the case. There are stories of people just buying guns without any kind of checks because of a loophole allowing private sales to take place without regulation, people who use their parent's or grandparent's easily accessible guns in their murderspree, people who use Legal Gun + Legal Modification to make an illegal gun.
I don't see why anyone needs any weapon that looks like it game out of a military training camp.