In "On Killing," Lt. Col. Dave Grossman embarks on a profound exploration into the psychology of taking a life, delving deep into the military's complex strategies designed to override the natural human aversion to killing. Grossman's meticulous research and insightful analysis shed light on how these techniques, honed on the battlefields, have permeated civilian life, influencing our media and contributing to an alarming increase in violence within our communities. This groundbreaking work, initially celebrated for its groundbreaking insights into the military's psychological conditioning, has been meticulously updated by Grossman to address the evolving nature of warfare, the disturbing rise in school shootings, and the proliferation of suicide bombings, making it as relevant today as it was at its first publication. Grossman's narrative is not just a mere examination of the mechanics of killing but an urgent call to understand the consequences of dehumanization and desensitization in society and combat. By weaving together harrowing firsthand accounts from soldiers, cutting-edge research, and historical analysis, "On Killing" presents a compelling case for the grave implications of society's increasing desensitization to violence. This seminal work challenges readers to confront the realities of a world where the act of killing is both a psychological burden borne by individuals and a troubling phenomenon with far-reaching social implications. It is an essential read for those seeking to comprehend the depths of human violence and the potential paths towards a more empathetic society.