I would love to live in a world that had no need of state enforcement, but how would such a world deal with highly functional sociopaths and psychopaths? They are around and it seems in such a world, if they were violent, scary and crafty they could cause a lot of disruption. A local armed militia could be one response but it seems like it could quickly escalate and move in the direction of feudal "states"?

Local violent responses that restore social equilibrium do not sound at all like justice. I know justice is elusive but is it secondary in your example to social equilibrium? Also, is not getting fined for DUI and warned by the local police not a mechanism to restore the equilibrium? I can imagine it would be less likely to result in a revenge attack than by destroying someone's car. I doubt whether the destruction of the car is the end point where equilibrium is restored in your example in any case.