Not that there was any doubt at this point, but: https://www.cnn.com/2018/11/30/us/st-louis-officers-undercover-assault/index.html
The Thin Blue Line is really real. I think more and more Americans are waking up to the fact that the cops aren't your friend, and you should actively work to minimize any interactions with them. When seconds count, the police are minutes away, at best. More likely, they'll be there the next morning to take your report and do paperwork. Today in the U.S. police are revenue generation first (tickets, legalized stealing via civil asset forfeiture), respect mah authoritah! second, and public safety a distant third.
What makes it worse is that the "good" cops don't weed out the bad. At best they passively ignore them or even enable them to thrive. As a result, people trust the police less, the cops feel that and it makes them turtle up and talk about how they "fear for their life," and the spiral continues.
I don't know the solution to the death spiral we're currently in. But I do know that if I were on a jury and the cop got up on the stand to testify, I'm not giving him the benefit of the doubt one iota because of the uniform or badge - and I believe that many are in a similar place. Big change from a generation or two ago.