Even if you forgive him drugging his wife, which you shouldn't, he's not exactly a good person.
Read through the antitrust stuff that happened in the 90's. He's not a good guy. I know he puts on this persona of "geeky nice guy", and I'll admit that I fell for it too long, but he's a multi billionaire, and like other multi billionaires he is not a good person.
If he is the "least evil person you can think of", then you're not thinking very hard.