Come on, you don't go to a mall with a pencil, a brick or a bow and kill 50+ people. The point of assault weapons ownership laws is to introduce friction, so getting a weapon that can go through kevlar is hard, and if you get caught, hell rains upon you.

The line must be set at some point, and of course people are going to tip toe around it, but that's not the point. And don't go Switzerland, if everybody in the US had proper training in how to use and (more important) store their weapons, and the government had an exhaustive control of every shell... Well, it would be different.