I cannot give a reason because I haven't read or even known about it, everything can't be about race when police officers interact with black citizens, liberals in the media keep pushing this narrative.
several white people have been killed by police too, shot or from being restrained in custody, the police make mistakes, to think it's all deliberate is mad, add on top the few bad apples and there you are. You are also disregarding quite quickly the fact many black police officers in the US have killed non white suspects/citizens, so how did that occur if it can only be racism when a white cop is involved?
ladyhawke was mentioning mental strength coping with racism. So a black man goes for a job and doesn't get it, the liberals have brainwashed him to instantly believe that he would have got it were it not for his skin colour, when that may not have been the case, of course he's going to get depressed and angry then because he feels he's had an injustice. So liberals have made things worse creating and then focusing on this obsession. That's my opinion, they've done more psychological and real harm than good.
ditto black youngsters being stopped and searched in london, the other day three police officers apprehended a young black man and were searching him at a train station, he was carrying a rambo knife and drugs, but several older black ladies were there moaning at the cops trying to stick up for the thug and interfere in police business.
Because they've probably been brainwashed that all police are racist, never mind the black criminal carrying a lethal weapon, which the police pointed out to the ladies but they still kept moaning, saying why weren't they wearing masks

so lame and an obvious diversion tactic, they didn't give a stuff about the policemen wearing masks, just trying to help a hoodlum who they thought the police were picking on because of his colour.
You never hear in the uk of chinese or sikhs moaning about racism and racist cops, and an industry built up around it, why exactly is that? [there are over 400,000 sikhs in the uk, although estimates could be up to 900,000; around 250,00 british chinese] Indians also have done very well here too, [1.4 million] so it's not all about skin colour and racism dished out to people that look different.