Longstanding trust issues that blacks have with the police, for historical as well as contemporary reasons, as well as greater solidarity among blacks than among whites or America at large, means that blacks protest when this happens. When a cop kills a white person, it isn't as often seen by other whites as feeding into a broader indictment of relations between cops and the community at large.
That seems about right.
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I mean, let's be honest, our criminal justice system is really too biased towards police when it comes to misconduct. The system simply does not adequately punish police officers who step out of bounds
(to put it lightly), and ironically it's hurting police more than it helps. They need to be trusted by the communities in which they serve, or else this idea really doesn't work.
At least some light is being shined on this issue.