Ideally in a healthy community there would be members who could encourage a bit of nudging and reformation of harmful behavior. Maybe nobody has bothered trying

Ideally in a healthy community there would be members who could encourage a bit of nudging and reformation of harmful behavior. Maybe nobody has bothered trying to get through to them. Perhaps some people genuinely thrive in hostile environments. Perhaps they just wish to establish themselves as superior within your group's dominance / status hierarchy. If much of their ego is tied up in their intellect then they probably need an outlet in which it may be flattered regularly. Perhaps it would be possible to construct situations in which more prosocial behavior is rewarded.