You went really deep down the rabbit hole. There is nothing illegal in demanding someone's resignation because of views, there is nothing illegal in thousands of other stuff I wouldn't do.

What I meant by fair is that according to me it's not OK to punish someone because of his/her views, when the person manages to separate personal and professional life. But if that's your thing, by all means, do it. I hope you won't complain if you are ever on the receiving end though.