In 1933 the philosopher Martin Heidegger declared his allegiance to Hitler. Ever since, scholars have asked to what extent his work is implicated in Nazism. To address this question properly involves neither conflating Nazism and the continuing philosophical project that is Heidegger's legacy, nor absolving Heidegger and, in the process, turning a deaf ear to what he himself called the philosophical motivations for his political engagement. It...