One time I captured this raider, and had him locked up in my prison and first fed just paste. Then i decided to take his eyes, Jaw, Ears and his arms and legs away from him after trying to attack and kill one of my colonists to escape. Oh and I also took his kidney too to make good use of it. Ha, that'll teach that raider group I guess, if i get any other prisoners, they'll see him and stay in line realising the big mistake they've made. That's probably the worst I've done on a playthrough; I usually go easy on prisoners. Unless they cross the line that is. 