Understanding bystander decision‐making: Experimental evidence on when and how people respond to crime

Abstract The decision to intervene when witnessing a crime is central to understanding bystander behavior and social control, yet there remain large gaps in knowledge about the factors that shape the decision to intervene and how. Drawing on theories of reactive guardianship, procedural justice, and crime reporting, we propose a broader conceptual framework of reactive guardianship and bystander decision‐making that considers both official (e.g., calling the police) and unofficial (e.g., confronting the offender) interventions. Using data from a national sample ( N = 1901) and a preregistered, video‐based, factorial experiment that manipulates both offender and victim race (Black vs. White), we explore the joint roles of race, policing attitudes, danger perceptions, and key individual characteristics in shaping bystander responses to crime. Findings indicate that policing‐related cognitions and emotions, gun ownership, and bystander characteristics (e.g., race, gender) are associated with differences in how people respond when they witness criminal offending. This study advances theories of formal and informal social control and offers policy‐relevant insights for improving public safety and trust in law enforcement.