This paper is a psycho-ethenography of a culture of violence. It is an exploration of the historical sources, the socio-cultural factors, and psychological dynamics involved in police violence. The results are informed by literature review and highlighted by case studies. Prevention strategies are presented in the light of resilience theory and law enforcement professionalism. The author is a clinical psychologist who has worked with urban law enforcement personnel for over twenty years. This work has included psychotherapy, critical incident debriefing, consultation, and training police personnel.