It is.. But at the same time, its a completely decentralized system and there are MANY that do a very good job at washing out the bad ones. There are plenty that deserve criticism, and even federal investigation/intervention. But by and large the system works.

There are millions of police, and hundreds of millions of encounters daily across a huge range of investigations and issues. boiling it down to twitter levels of context is bad and applying such broad strokes is also equally bad. Its certainly not going to encourage good ones to sign up.

I know with the way this type of stuff is being portrayed, its a no win for most police, they could quadruple the salaries overnight and some would still balk, because no matter what it a loss.

Shunning is crap. Instead of resorting to such dark-age extralegal tactics, how about we get some prosecutors who do their damn jobs and prosecute criminal police? Unfortunately prosecutors are generally elected and many people don't want to admit the root of the problem is with the electorate who choose to elect and re-elect prosecutors who don't want to do their jobs.

Depends on the severity of the act. Shunning is excellent punishment for low-level misbehavior. If you allow misbehavior to accrue and expand, eventually you'll get to a case where you need a prosecutor.

That prosecutor's job would be easier if the criminal officer's colleagues would testify against them, which goes back (again) to social mores.

Prosecutors rely on cops to get their prosecutions, and if the prosecutor is the only one who faces repercussions for charging a cop, then obviously they're going to be loathe to charge any cops.

Honestly, though, the system isn't recoverable in most regions. American police, the ideological successors to slave catchers, suffer a rot that is too deep. Many are literally white supremacist gangs. It isn't a system that can be reformed.