What is the significance of our gut feelings? Can they disclose our deep selves or point to a shared human nature? The phenomenon of perpetrator disgust provides a uniquely insightful perspective by which to consider such questions. Across time and cultures, some individuals exhibit signs of distress while committing atrocities. They experience nausea, convulse, and vomit. Do such bodily responses reflect a moral judgment, a deep-seated injunction against atrocity? What conclusions can we draw about the relationship of our gut feelings to human nature and moral frameworks? Drawing on a broad range of historical examples as well as the latest scholarship from the philosophical and scientific study of emotions, this book explores the relationship of cognition and emotion through the lens of perpetrator disgust. Considering a range of interpretations of this phenomenon, it becomes evident that gut feelings do not carry a straightforward and transparent intentionality in themselves, nor do they motivate any core, specific response; they are templates that can embody a broad range of values and morals. Using this core insight, the book proposes a contextual understanding of emotions, by which an agent’s environment shapes their available hermeneutic equipment—concepts, categories, names, scripts—that individuals rely on to make sense of their emotions and navigate the world.