What good could possibly come from publishing something like this?
I could understand writing it and deleting it as self-therapy.
It’s good to remind people that they might be related to someone toxic, and it’s OK to cut them out of their lives. Even a mother or father can be just plain a bad person, and one of the hardest parts of editing toxic parents out of your life is the push from society. Society loves to say “but he’s your father”, and a lot of people don’t have the energy to say back “but he’s a scumbag”. An obit like this just might give somebody that energy to improve their life.