> If you hold police accountable, they respond by refusing to work. That's a problem that, at this time, has no solution

Of course it does. You dissolve the police department and create a new one. New York did it twice, first replacing the city-controlled Municipals with the state-controlled Metropolitans [1], and then in 1870 creating the NYPD [2].

[1] https://en.wikipedia.org/wiki/New_York_City_Police_riot

[2] https://www.nyc.gov/site/nypd/about/history/history-timeline...