@flo
Israel has a lot of experience with this. With America, it depends on the state.
The reason for why we need assault rifles is the same reason you want them banned. Since they’re much more proficient at killing, it’s equally the primary weapon of choice for self-defense. Just like a handgun is the primary weapon over the knife since the knife is the weaker weapon. You don’t want to have a nice fight with the criminal when he enters your home, you want him dead before he has a chance to harm you. In public, the handgun is more practical to carry, but at home, the assault rifle is primary and the handgun is secondary. There is no shortage of crime, riots and tyrannical governments and that is why you need the best of the best to increase your chance of success.