NPR’s “Fresh Air” replayed an interview with novelist Philip Roth since the movie version of his novel “The Human Stain” opens today. The most interesting exchange occurred when Gross asked if Roth was ever ideological and he said no, “I’ve never been the ideological type.” A few minutes later, he was airily dismissing the notion of sexual norms as a “cruel” piece of oppression. “There are no sexual norms any more.” That sounds deeply ideological, doesn’t it?