The column I've written over the past year that attracted the most reader response was one last December about Peter Singer, the Princeton professor of ethics who sees no ethical problem with polyamory, bestiality, necrophilia or some kinds of infanticide. Readers frequently asked questions concerning past and future: How did the individual called by The New Yorker today's "most influential" philosopher develop such beastly positions, and how should conservatives fight his influence? First, the past: Although Singer would like to think that his conclusions are the result of pure intellectual labor, his family history is worth noting. He and President...