This. I'm a relatively well off white male, and I have encountered exactly this happening. Twice...
The first time, I was riding in my car with friends. Had we been drinking? Absolutely. But the driver didn't. He was a heart surgeon at OSU Hospital who was on call. He offered to drive the group because of the fact that he could not possibly drink anything. This was back in 2002. Why is that important? Oh, I don't know. Maybe because a few people crashed some planes in a some buildings, and the entire US turned against anyone who wasn't white. See, my friend, who was a well known heart surgeon, happened to look middle eastern. He was sober. Hadn't drank so much as a drop of alcohol... and he was forced to pull over to a parking lot.
In said parking lot, we were surrounded by 6 police cars and 3 paddy wagons. I was in the back seat, behind a window tinted so you couldn't see me. I had 5 other friends with me. An asian, the middle eastern who drove, an african american, and two other white friends. Every... single... minority was put in handcuffs in the backs of the cop cars. Not one of the whites were. I was mildly drunk, which means I was stupid enough to have no fear of what was happening. I yelled at the cops because of how they treated my friends. I scolded them for how my minority friends were treated differently than we were. I was given "fantastic" answers like, "would you like us to handcuff you too?!?!" to which I "smartly" replied, "yes, and lets explain to the courts why."
It turns out an asshole neighbor of mine saw a bunch of minorities getting into a car (my car!!!!), and reported it being stolen. Having nothing better to do, the entire Columbus, OH police department responded to the theft of a 1984 Chevy Suburban that had more rust than metal. They pulled my friends out, at gunpoint, by their necks and handcuffed them in the back of police cars.
Had things gone slightly different, I might be attending a friend's funeral. It frightens me both in how close I was to having a friend murdered by the police, and looking back and seeing how easily they would have justified it. Only because my friends did not assert their rights are they alive, and ironically, only because as a white male who did assert my rights were they freed.
There are bad people out there. There are great cops out there. The problem is, the police unions are so "pro cop" that any / all attempts to remove the bad cops from the force is null and void. They will protect a "bad cop" at the expense of 1,000,000 "good citizens" and won't think twice about it. I did file a report about what happened to my friends and I, and received a response that the police pulling my friends out at gunpoint was 100% justified because random citizen X reported my car as being stolen.
That was the first time... The second time... was even more "unfortunate". I'll simply say, I understand why poor people do not trust the police. I'm fairly well off, and have personally seen the abuses they are willing to do. The only difference is that I'm well off enough to be able to retaliate via the courts, and my friends often are not.