What really ought to be done is to take away the opportunity for bad people to be able to abuse any sort of power.

The thing about policies like prison abolition is that they don't work by themselves. They must be accompanied by changes in society as a whole. This includes designing systems where people don't need to be locked up. This primarily involves removing the financial cause of crime (poverty and desperation) through welfare and socialism and all that cool stuff, and dealing with the psychological cause of crime (rage, greed, etc.) with significantly better mental healthcare. Even utter selfish psychopaths will usually cooperate in a fair system because they recognize that cooperation and mutual aid is beneficial for all, including themselves.

Still, some people are just unrepentant monsters. Personally I favor sending such people to live with each other on an isolated island where they're free to do whatever so long as they stay there. Sort of like a self-managed Australia.