The first proof to support the notion that humans are naturally evil is through the tendencies of human beings to commit crimes. According to Sigmund Freud (1856-1939), who is credited with the development of psychoanalytic theory, all humans have criminal tendencies. Furthermore all humans have natural drives and urges repressed in the unconscious. Through the process of socialisation, however, these tendencies are curbed.
http://criminology.wikia.com/wiki/General_Theory_of_Crime
The primary evidence that people are generally evil is evident by the number of wars. Research discloses not only that the genocide was centrally conceived, planned and directed, but that there were some who worked at providing the intellectual rationale for the genocide and the propaganda which justified and rationalized the slaughter. Most countries have experienced their