Scholars have long argued that dehumanization causes violence. However, others have recently argued that those who harm do so because they feel pressured or view violence as justified. Examining the Rwandan genocide, this article contends that contradictory theories of dehumanization can be reconciled through consideration of cultural and moral sociology. Research on culture and action demonstrates that when people strive to implement new practices, they often explicitly work through them cognitively and emotionally. With time, however, these conscious processes diminish until actions that were once new proceed with ease. In another vein, morality research suggests our affective responses to actions indicate their moral significance; when we do not react emotionally to actions, they are morally irrelevant. Herein, I combine these ideas with a temporal analysis of Hutus’ recollections of killing Tutsi and find cognitive, emotional, and relational transformations rendered killing mundane over time. Dehumanization was a consequence of violence, not a cause.