Is the Only Good Ork a Dead One?

Is there ever an account of a rehabilitated ork, or even an ork prisoner? Or in the entire legendarium, is the only good ork a dead one? I think that tolkin struggled with all these questions. Yah, i think he did. He had a serious problem with the idea that corruption can be passed on from generation to generation,. don't you? Ye, it becomes an inherent thing. It becomes part of its nature. Othe valar can't even make the adine immortal, no! If morgoth can corrupt even a man so greatly that that corruption is then passed onno, from generation to g generationally, that it becomes an