We explain the variability of correlations between education and protest attitudes by specifying four processes and the conditions under which each operates. We postulate that education affects attitudes to protest by increasing commitment to civil liberties, by decreasing support for the use of violence, by increasing knowledge of the protesters' grievances, and by changing one's position in society and hence one's interests and identifications. These four processes account for over half of the variance in the obtained correlations in a secondary analysis of 17 surveys. We conclude that (1) education reduces support for the use of violence by either protesters or authorities; (2) education increases opposition to government repression; (3) when protest issues are class-related, education decreases support for issues identified with blue-collar groups; (4) education increases support for protest among persons remote enough from the protest to lack first-hand knowledge of it.