You may underestimate the damage of a lawsuit. The first really great ‘exemplar’ lawsuit that comes through will absolutely bankrupt all retirees, good or bad, as that kind of fund is usually tightly managed and rarely enough. It’ll be crushed.
If you want to sic it to the bad cops but not the ones that actually did as good a job as possible, collective punishment is no good here. In fact, it’s still a war crime.