"The term 'prejudice' has been loosely use to refer to biased intergroup perceptions, judgments, or attitudes. But it does not always mean the same thing to various scholars who either associate prejudice with cognitive distortions or link it to injustice. The former may be labeled 'cognitive prejudice' and the latter 'moral prejudice.' Cognitive prejudice includes stereotypical judgments of a group, erroneous generalizations, formation of social attitudes despite contradictory objective evidence, and the Fundamental Attribution Error. Moral prejudice consists of the designation of a different set of rights, principles of justice, and judgment of basic value depending on one's social status, race, ethnicity, or other group membership. Of course, moral prejudice generally is based on the same biased thinking as cognitive prejudice, requiring separate explanations. Revenge, which can lead to feuding, may continue long after the original cause of conflict has vanished."
Sun, K. (1993), "Two Types of Prejudice and Their Causes," American Psychologist 48, no 11: 1152-53
Arendt, H., Eichmann in Jerusalem: A Report on the Banality of Evil New York: Viking Press, 1963.
Bandura, A., Underwood, B., and . E. Fromson, "Disinhibition of Aggression Through Diffusion of Responsibility and Dehumanization of Victims," Journal of Research in Personality 9 (1975): 253-69.