The author is trying to make some weird point that when blacks kill other blacks it is not really black-on-black crime because . . . because why?
Because he doesn’t want it to be. Too bad; it is, and it isn’t anything else.
The author tries to make the point that blacks don't kill each other more than whites by arguing that blacks have a similar intra-race murder percentage as white people do. Meanwhile, the pinhead author completely ignores the total number of black people that other black people kill which is far, far higher than the total number of white people that other white people kill.
I hope that, for his sake, the author is being intentionally disingenuous because it's hard to imagine that he can be this stupid.