I see what you're saying, and I agree to some extent. I can think of circumstances where the torturer thinks he is doing something for the victim's own good. But in this case Gadreel was only the subject because he was holding onto Sam's body, with either dubious or nonexistent consent to do so. So for this particular example, I don't think it matters that Gadreel had nothing to gain. He had no right to any say over his body because it wasn't rightfully his.