The nature of the beast
When I was a first-year Ph.D. Student in Sociology at Oklahoma State University, I was taking a criminology class and the professor asked the class why man is still so violent and reactionary after thousands of years of socialization not to be. I replied that it was the nature of the beast and a second-year student laughed at my response. In Sociology, we're taught we are who we are because of all the experiences we have from birth right up to death's door and I subscribe to that theory. But I also remain committed to the nature of the beast theory too because it's hidden and sometimes not very deeply, in the psyche of all men.