He's not perfect, but behind the scenes he's a genuine and upstanding person. I've met lots of wealthy smart people, and he's the only exception. He was the only person I trusted in this situation, and I'm genuinely nervous that he's no longer running OpenAI.
But as a general point, you can be both a "good person" and still do bad things. Or you can be a good person in some areas, and a not-so-good person (or even horrible person) in some other areas. People are complex.
Of course it's entirely possible that Altman is just a really good person, but I wouldn't be quick to make assumptions.