There was, you know, a time when arguing about arguing actually felt vital. Really! To wit: In 1975, Susan Sontag wrote an essay on Leni Riefenstahl for The New York Review of Books. It was not her first comment on the director of the Triumph of the Will. She had, earlier, written of Riefenstahl's work in more admiring terms in Against Interpretation: "The Nazi propaganda is there. But something else is there, too, which we reject at our loss." But this time she'd been asked to review a book of Riefenstahl's photography of the Nuba tribes in Sudan, and the bland indifference of the jacket copy provoked her.