I'm saying its a shitty thing for people to be doing, but its only a moral crisis because black teens have started doing it.
You're just assuming this. What are you basing this on? I would feel exactly the same way about it if it was white or Asian teens.
It kind of seems like you're trying to make black people the victims in this. Progression of events:
1) Black teens try to knock out random people for fun.
2) News reports say black teens are trying to knock out random people for fun.
3) You say that the people reporting black teens are doing it are trying to scare white people and make it a moral issue.
It is a f***ing moral issue.