Aside from the morality, what about the practicality? Who rapes the rapists? The judge? The executioner? They'd have to be "up" for the job... Maybe offer it to other inmates as a reward for good behavior?

other inmates and depends on the state. might be other races, might be your race in Cali. in other states might be another gang, might be your gang.

even in the dropout yards there are chances to be raped, sometimes much higher than in GP.