Nurture: Milgram, Zimbardo, Tajfel, Sherif & others have endeavoured to show how the power of the social situation & social context profoundly influences human behaviour :arrow_right: bad or good behaviour is a consequence of the social situation, influence of the social group & level of identification with that group etc., NOT the character/disposition of an individual, which is a biological factor down to the influence of nature, e.g., authoritarian personality (although upbringing, i.e., social factors, also plays a part in the development of such a personality).