When you're making such assertions, it's best to approach the constructs accurately. Where you're living makes a big difference on this type of violent crime, and the racism is more targeted than global (Black, Hispanic, White, and Asian have different levels of involvement in this sort of crime). That doesn't make it better, but it might change what is ultimately done that can successfully stop it.
I don't trust cops any more than I trust people in general, but this thread is hyperbole because it paints an entire profession as acting like its worst members. Even if police are inordinately worse than an average person (a tough sell), this thread is still hyperbole.
I've had the good fortune to not have many situations where calling the police was merited, though I've reported a few accidents that looked bad enough that the people involved might need urgent medical attention.