Before he became a member of the PayPal Mafia or invested in Facebook, Silicon Valley billionaire and Donald Trump delegate Peter Thiel co-wrote a book called The Diversity Myth: Multiculturalism and Political Tolerance on Campus. Published in 1995, the book is notorious for its rigorous defence of a Stanford law student's homophobic outbursts at a staff member. Just last week, Julie Carrie Wong of the Guardian unearthed another unsettling passage in which Thiel and his co-author, David O. Sacks, cast doubt on the believability of undergraduate women who claim their male peers have raped them. Now Thiel is backtracking.