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Off-Ramps from Violence: The Bystander Effect, Early Intervention, and the Architecture of Community Response

A. C. Applebee, L. N. Combe · 2026

Abstract

This thesis synthesises evidence from behavioural psychology, criminology, social network theory, and field deployment data to examine how bystander intervention dynamics shape violence outcomes -- and how structural system design can overcome bystander paralysis at population scale. We advance three hypotheses, each supported by convergent empirical evidence: 1. The Visibility-Exit Path Hypothesis: The early presence of witnesses or caring responders provides aggressors with face-saving exit ramps, reducing escalation to lethal violence. Supported by Routine Activity Theory (Cohen & Felson, 1979), CCTV intervention data (Philpot et al., 2019: 91% intervention rate in public conflicts), and domestic violence wearable alert pilot studies (DHS WAMS, 2022).

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