Beyond Persuasion: Protest’s Direct Behavioral Impact on Bystanders

Despite decades of scholarship on protest effects, we know little about how bystanders, citizens who merely observe protests without participating, are affected by them. Understanding the impact of protest on bystanders is crucial as they constitute the silent majority whose latent support, normative beliefs, and concrete actions can make or break a movement's broader societal impact. We address this gap with a novel field experiment in Berlin, Germany, randomly routing pedestrians past (treatment) or away from control three large-scale Fridays for Future (FFF) climate strikes. Additionally, we conducted a one-month follow-up to assess the persistence of effects. We find no detectable impact on climate attitudes, vote intentions, or norm perceptions but a substantial increase in immediate donations to climate causes. These results suggest that protest is more likely to influence bystanders through immediate behavioral cues than through changes in attitudes or norms. Our findings challenge the prevailing assumption in both scholarship and public discourse that protests reshape public opinion in a direct and unmediated way, calling for renewed theorizing of protest effects that centers on observers' immediate behavioral activation rather than just opinion change mechanisms.