This is both about race and not about race.
The underlying problem is police brutality. The OP poo-poos its extent but it is something that happens much too often and quite frankly – we have all had enough of it. A few in the Jewish community have not been paying to this problem the same way they did not pay attention to prison/justice reform problem until it bit a few of us in the rear but the fact is, police brutality is a huge problem in America. How long are Americans going to turn a blind eye to police brutality as it gets worse and worse every year? We have become numb to the news but if you paid attention there was a story of police brutality every day. Yes, police brutality is color blind and (a small minority but still) too many cops are brutal towards everyone, equally and so we should all be protesting against it.
But this is also about race. Even though there is no reason to believe that this violent police officer was motivated by racial hatred (or that police brutality, in general is motivated by racial hatred) the facts are clear that the black community bears the overwhelming brunt of police brutality. Most of the victims of police brutality are people of color because those communities have greater exposure to police interaction. The more often a community is exposed to the police, the greater the likelihood someone in that community will fall into the hands of the minority of police officers who are not necessarily racist but violent and become a victim of police brutality.
So why does the black community have a much greater exposure to the police? There are a myriad of reasons (many of which are the fault of black communities and individuals in those communities and many which are not) BUT systematic racism, in my view, certainly plays a big, big role in many parts of this country. And so that needs to change, too.