“Teens”.
There was a rash of attacks like this on cyclists in Portland, Oregon, last year, but it wasn’t called a game.
Actually the “knockout game” events are really interviews for “anesthesiologists” under Obamacare.
How to solve this problem.
It requires a few hundred people willing to lose their jobs and have their garage spray painted.
Everybody send a letter to the editor of their local rag. Carefully point out the race of the perpetrators, and the races of the victims. Criticize them for hiding that fact. Only a few letters will get printed but we will have broken the taboo.
Willing to do it?