They're being asked to do literally everything but are armed and trained for anti-violence first and foremost.
The thing is, police brutality is heavily promoted on the news right now because, well, it outrages people, that's the point. It generates more ad revenue that way.
But if you hear it and see this every day, and someone says the word "police", your mind immediately thinks of "brutality". Not that it doesn't exist, but availability bias makes the issue seem much bigger than it actually is. This is why it's a bias.
And to put the danger of racist white police officers into perspective: https://i.kym-cdn.com/photos/images/original/001/163/274/fbf...
Yes, racists are a problem, but not a very big one.
I'll put this to you - people of color are absolutely justifiably fearful of any interaction with the police, and they have to experience it much more frequently. You need a source? Here - https://www.nytimes.com/interactive/2020/06/03/us/minneapoli... Hope you'll read it.
And this includes ALL white people, much less "white people who happen to be police officers". My argument is not saying police brutality doesn't "exist", I'm saying it's "overblown".
Finally, I am a "person of color" myself and I don't find the police behave to me in the way you describe. They don't act that way towards my father either, not even once in his life. Or any of my person-of-color friends for that matter. Admittedly, this is anecdotal, but my main point is the overall data does not point towards your premise.