I remember seeing a hypothesis that ADHD would have been beneficial in Hunter-gathering, as you would more quickly move from plant to plant rather than fully depleting a resource. It was just one study where they had a sort of game/simulation to test it though, so very early days on that theory.
I mean, he had been abusive for years, it was sadly not a unique nor surprising case, except for his fame, but fame doesn’t make you a good person.