On Killing: The Psychological Cost of Learning to Kill in War and Society
There are, of course, many insights, most of which seem commonsensical ("Well, OF COURSE that would affect you!") but, in the context of the book and first-hand accounts and logical conclusions, become all the more convincing. It has certainly made me rethink the conversations and recommendations I have had with teenagers in the past about movies and video games, for example.
A point Lt. Col. Grossman makes early in the book is that conversations and research on the subject of killing often are (or have been) like "a world of virgins studying sex". In the strength, fitness, and conditioning community too, you will find many writer-gurus that have not spent much time in the racks and under a barbell. In this regard, they are like a bunch of virgins in lab coats, dispensing advice about sex when, in fact, the only advice they may be qualified to give is about abstinence.