Pope Francis went on the record saying he hoped Hell is empty. Torturing even the worst person for all eternity is overkill in my opinion, maybe after 500, 5000, 5 million years of celestial reeducation, if he really put the effort in, Hitler's soul could be free. He's only human and given the absolute worst circumstances and decisions I believe any of us could end up fucking up as bad as him.
FWIW I dont really believe in an afterlife but I do want to believe in universal redemption, as difficult as that can be sometimes.