There's another science fiction writer vying for your spot as Most Nuttiest, and it's Orson Scott Card.
I don't know anything about the guy's writings, other than that Luke, among other friends, reads his books. Luke points to this interesting analysis of an essay of Card's about gay marriage.
I point it out because it 1) shows the astounding mental and logical gymnastics those who would deny a large number of Americans their rights will employ to give their position a veneer of sense and 2) the point-by-point debunking of Card's arguments is very good, showing the lack of need for those same kinds of gymnastics when arguing the side of truth, compassion and reason.