I've encountered plenty of nice cops. Though I live in Europe.
So it is quite US-centric to say all of them are bad, because there are plenty of parts in the world where they don't suck and the system isn't broken.
I think "all cops are bastards" is a harmful generalization. While abuse of police power is a systemic problem, there are also many police officers who don't abuse their power. It's better to focus on the systemic issues that allow for abuse of power, rather than dismissing all cops as inherently bad.
No. Because if they were doing their job they would be pushing the bad officers out. Instead the culture is either join the bad apples or stay quiet about the bad apples.
And the rot is so bad the "good ones" have, in many cases, lost touch with what their standards should look like. When the military gives more de-escalation training than the police, there's a major problem. Instead the police are going to classes that tell them to shoot first and forgive themselves later.
It's structurally impossible to remain a police officer in the US and be a good person or good police officer.
If there are 11 people hanging out with and befriending 1 Nazi, you have a dozen Nazis. Why would it be any different for cops? Not fighting against the corruption while working under being part it is the same as supporting it.