And eventually he mellowed out even at the end of said Saga where he was upset over his son's death showing he was already changing as a character hence Future Bulma being shocked when she heard. He took a while because he was an evil asshole for all his life but he said himself he was losing that part of him when he explained why he let Babidi take over, it's not like he pretended that he did not deserve to go to hell when he sacrificed himself after all he had done but it showed he was finally letting go of that part of him when he acknowledged it and that's where Toriyiama seems to have been planing it from the start.