A curious association

The Discovery Institute is touting their new book that they purport "shows [the] influence of Darwinian principles on Hitler's Nazi regime" (I think you'll be hearing more about this book here soon). I'm wondering about something, though. If they so deplore Hitler's racism, why have they been using a publisher whose main claim to fame is the publication of right-wing anti-Clinton diatribes, and whose heir the Southern Poverty Law Center describes as a "prime mover and shaker in white nationalism publishing" and supporter of "white-supremacist luminaries"?