1. Instead of the city paying millions for retribution, the court could charge the Union Pension Fund. Hit the cops in the pocketbook to promote self-policing to get rid of the out-of-control individuals.
2. The courts probably won't go for item #1, so the city issues insurance policies for each cop. The insurance policy pays the plaintiff instead of the city. If a LEO is so out of control that he has an excessive insurance payout, he loses his insurance coverage and in effect ends his career as a cop, his pension based upon time served.
Gross police conduct often leaves the officer to defend themselves. Most police carry liability insurance.