> Is this a real risk in parts of the country where old people need serious fire power to defend themselves?
I don't think the way to reason about this is based on "serious fire power" vs some other kind of weapon that you feel is more acceptable. All guns can be lethal.
If grandma feels unsafe, she might get a gun. I can understand how older people might want firepower when they know they can't physically fend off an attacker.
If you accept grandma's right to be armed, would you rather she use a more or less dangerous gun?
Most gun controls make the weapon less safe. It's similar to how people think sharp knives are more dangerous, but they're actually much safer than dull knives.
The way to think about it is that the round is doing most of the work. The gun is just a delivery system for the round, and besides fully automatic weapons, every other weapon choice is about safety, accuracy, and reliability.
A "Short Barrel Rifle" or "Short Barrel Shotgun" is easier to operate, and therefore more safe than a non-NFA rifle. They were regulated to make people feel better, not to add safety. The velocity of NFA SBRs is actually lower than the velocity of a bullet leaving a non-NFA 16" barrel.
A silencer is not silent, it's just hearing protection, but also requires an NFA tax stamp. They don't sound like they do in the movies, and there's no mistaking it's a gunshot.
Expandable stocks and foregrips are scary looking, but the whole point of them is to gain accuracy, which makes the gun safer. These are usually legal, but there are silly regulations around these too.
Larger magazines allow you to focus on your threat instead of counting your bullets. For now, these are legal, but banning magazines with large capacity is a common talking point.
The reason all of these items look scary is because we see military with them. But even in the military, they're not to make the guns more lethal. The whole point is operational safety.
If you don't think anyone should be allowed to have a gun, that's actually a more defensible position. If people are allowed to have guns, they should be allowed to have any gun and any gun attachment that improves their safety.