Neither the intelligence, nor the thinking, the memory, the imagination, or the language of a killer are the psychological causes of his murders, but the deeper springs of his personality: the emotional, motivational, natural factors that were generated not only by hereditary, biological factors, but by the factors related to education, socialization, culture and, especially, the socio-economic environment the individual lives in. The murderer's anti-social attitudes become effective through the acquisition of appropriate tools, of some stereotypes, skills and abilities that will help him/her become efficient in doing his/her crimes.