‘Contradiction’ as the cause of revolution is associated with :

Mao Zedong placed the philosophical and political analysis of 'contradiction'—explicitly developed in his 1937 essay On Contradiction, distinguishing between antagonistic and non-antagonistic as well as principal and secondary contradictions—at the centre of revolutionary theory and practice. Psychological theories focus on relative deprivation and frustration-aggression, while Régis Debray is associated with the foco theory of guerrilla warfare.