POPULAR PSYCHOLOGICAL EXPLANATIONS OF POLITICAL VIOLENCE ARE BASED ON THEORIES OF RISING EXPECTATIONS, DEPRIVATION, AND RESULTING FRUSTRATION THAT LEADS TO VIOLENCE. THESE THEORIES SUFFER FROM BOTH DEFINITIONAL AND METHODOLOGICAL PROBLEMS AND FAIL TO EXPLAIN THE PROGRESSION FROM INDIVIDUAL EXPECTATIONS OR FRUSTRATION TO COLLECTIVE ACTION. MOREOVER, NUMEROUS STUDIES BY EXPERIMENTAL PSYCHOLOGISTS INDICATE THAT FRUSTRATION DOES NOT NECESSARILY LEAD TO AGGRESSION, THAT MUCH AGGRESSION OCCURS IN THE ABSENCE OF A FRUSTRATING SITUATION, AND THAT LEARNING CAN EITHER INHIBIT OR REINFORCE AGGRESSION. THE PSYCHOLOGICAL EXPLANATION OF POLITICAL VIOLENCE HAS BEEN WIDELY ACCEPTED BY SOCIAL SCIENTISTS BOTH BECAUSE IT APPEARS PLAUSIBLE AND BECAUSE IT IS PARTLY TRUE. IN CONTRAST, AN EXPLANATION WHICH LINKS POLITICAL VIOLENCE TO A RATIONAL CALCULATION BASED ON A SENSE OF INDIGNATION IS EQUALLY PLAUSIBLE AND PROVIDES A CLOSER LINK BETWEEN PSYCHOLOGICAL AND POLITICAL THEORY. ANALYSIS OF THE 1919 CHICAGO RACE RIOT, THE WATTS RIOT, THE 1968 RIOTS FOLLOWING MARTIN LUTHER KING'S ASSASSINATION, AND RADICAL STUDENT VIOLENCE INDICATES THAT VIOLENCE IS BASED ON MORAL OUTRAGE RESULTING FROM UNJUST OR UNWORTHY TREATMENT. THE CONCEPT OF INDIGNATION INVOLVES NORMS AS WELL AS PSYCHOLOGICAL MECHANISMS AND IS BASED ON LEARNED STANDARDS. VIOLENCE, THEREFORE, CAN BE A RATIONAL POLITICAL RESPONSE TO MANY FORMS OF GOVERNMENT ACTION, ESPECIALLY GOVERNMENT VIOLENCE AND IS NOT NECESSARILY BASED ON PSYCHOLOGICAL DEPRIVATION OR EXPECTATIONS. FOOTNOTES WHICH INCLUDE REFERENCES ARE INCLUDED. (CFW)