They've created a leg to stand on: the inherent criminality and violence of the black man. Notice how Fox and right wing media always harp on this idea, and straight up stereotype black men as angry or having "violence problems." You never hear anyone talk shyt like that about other races. And ultimately that's why every case of police brutality is spun, and the dead black male is blamed for his own murder. In this mentality there are no black victims. If you get killed by a cop YOU likely instigated it, or the cop's accident is understandable "given how violent black men are."
"That poor innocent cop was just trying to do his duty, he didn't mean to kill that black kid but can you blame him, given how violent blacks are?" That's how all these cases go down. They've basically declared open season on blacks.
If you're a white victim of murder, the murderer is white in nearly 90% of cases. Likewise if you're black and a victim of murder, the murderer has a 92% chance of being black. In short people get killed by their own race. Yet some people on the right have decided that the "high" rate of black on black crime means we're prone to violence, nevermind that the rate of white on white crime is pretty fukking high.