There are ways to hold lawyers accountable that sadly don't exist for cops.
This is similar to a shareholder action for a public company that is being run poorly (however you define that), but where the board is also complicit. No choice except to vote for new board members. If you want, and care enough, and can get enough others to care enough also.
If a politician, who is technically the boss, starts to clean house of the unified and armed tribe supposedly meant to work for the people of the city, the tribe will usually make quality of life for everyone go down, if not just from the myriad legal challenges, but also from work slowdowns and stoppage.
So then the question is will voters stand by the politician while crime goes up and unsolved for the 10+ years it takes to rebuild a more accountable police force (which isn’t a guarantee either).
Speaking of crimes, I've murdered this analogy
Hey, wait... this sounds a lot like a gang. How did the rebel nation get so "cucked"?