Okay, there really isn't much you can do about random crimes like this. It's not like we live in A Clockwork Orange. It's usually young males doing dumb shit, which is what young males are good at. People have been driving around and shooting at stop signs for fun since forever. Guess what, there are plenty of cases of those shots killing other drivers, passengers in the same car, even hitting windows and killing people in their house. Same mentality, bored kids doing dumb stuff. Now are your house windows made of bulletproof glass?
The frequency at which the knockout kings stuff happens doesn't require some huge response. And it's done for attention, so drawing attention to it has the opposite result that what you think it was. We already have laws about assault that cover it...people that do this know what will happen if they get caught. Making it some national headline just puts it into more heads, without detering anyone. Someone isn't going to say "Hey. I was going to beat the shit out of a random person but my congressman said it was a bad idea so I better not."
Go to your local police station and talk to a detective. You are way more likely to be hurt or killed by someone you know, as opposed to a stranger, by a huge margin. But if you took it from the news, every quiet neighbor is a serial killer.