All those who advise and use shotguns disagree, and a short carbine is certainly more manageable than a 20ga or greater shotgun. And they're certainly easier to aim under stress than a handgun, and ideal for bunker tactical situations (e.g. you stay in your bedroom waiting for the police to arrive, too bad for the intruder if he tries to break into that room ignoring your warnings).
Too powerful for drywall.)
I'm told this is most certainly not the case, or, rather, handgun bullets and heavy shot loads penetrate a lot more. I don't know because I prefer a 1911 for inside the home self defense, but I would most certainly use a rifle outside the home if opportunity allowed. Plenty of people have used AR-15 pattern rifles in self-defense, inside and outside the home.
and actually illegal to hunt with because the bullets are literally too small to bring down game.
They're fine for anything hog sized or below, and as far as I know legal in those domains. With the right modern bullet selection would be OK for white tail deer and I believe legal in some states (but I hope not for bigger game), but the laws from before the revolution in hunting bullets obviously weren't written with those in mind. I mean, it was derived from this successful varmint round: https://en.wikipedia.org/wiki/.222_Remington
ADDED: So, given all the real civilian world civilian utility they have, for a lot of men you could view them as modern versions of accessorizing a car.