But who are "the worst scum imaginable" here? I think a certain degree of sadism would have to be involved to put anyone through (an apparent) 1,000 years of torment when the human lifespan is at most a tenth of that. Even among the most notorious people alive today, I can't think of many who have made others suffer for even that length of time. I think that the tormentors should not suffer any longer than the tormented have, and they should suffer only as the tormented have. To expect anything more is not justice in any sense, and it's not retribution. It's just glorified schadenfreude.