Sad, but it doesn’t really surprise me. It seems that we keep learning about people who made great contributions to art and science but were horrible persons in other ways.
There is a definite ethical dilemma in whether to separate a person’s contributions from their personal failings, but I don’t know that there is a defined line on whether or how to do so. It’s a very gray area. It may be something that each of us has to determine on our own.
Thank you for sharing your experiences with him. I wasn’t aware of his anti-climate science alignment.