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What is the right way to protest? On the process of justification of protest, and its relationship to the propensity to participate in different types of protest

Abstract This study explores how citizens in Spain perceive different tactics employed in anti-austerity protests in 2011–2013, and tests the model of the process of justification of protest. This model combines the elements of Gamson’s collective action frames theory (effectiveness, anger and grievances, operationalized as appraisal of harm) with the concept of legitimacy. It also links justification to the intention to participate. We empirically differentiate between three protest tactics: normative demonstrations, non-normative peaceful strategies, and non-normative violent actions. We find that demonstrations are perceived to be more legitimate, but less effective than non-normative peaceful protests. Violent strategies, on the other hand, are seen to be more effective than legitimate. We postulate and find that legitimacy and effectiveness partially or fully mediate the impact of political ideology, anger, and appraisal of harm on the probability of participation in non-normative protest. Finally, we establish meaningful differences in the predictors of the likelihood of joining normative, non-normative peaceful, or non-normative violent protests. Overall, our results suggest that the study of justification of collective action and especially, the inclusion of the notion of legitimacy, enriches our understanding of the popular approval of and propensity to participate in different forms of collective protest.