Ideologically motivated mass shootings: a crime script analysis of far-right, far-left, and jihadist-inspired attacks in the United States

ABSTRACT This study uses a crime script analysis to examine far-right, far-left, and jihadist-inspired ideologically motivated mass shooters (IMMS) in the US (1970-2019). This work provides a comparison of incident rates and shooter backgrounds, as well as the preparation, execution, and conclusion of attacks. When comparing the three IMMS types, findings indicate far-right incidents were most common, far-left shooters were largely Black Nationalists, and jihadist-inspired shooters had more success in life (college graduates, employed, married, parents). During initial preparation, IMMS often leaked violent intentions and had facilitating conditions including criminal, domestic violence, and military histories. Jihadist-inspired shooters had more planning, and far-left shooters often accessed guns illegally. During attack execution, IMMS incidents often occurred in the South and involved open-space and/or unrestricted access locations. Jihadist-inspired shooters targeted government locations more often, while far-left incidents often occurred outside with law enforcement on the scene. During attack conclusion, IMMS incidents often ended quickly and involved gunfire with police. Jihadist-inspired shooters had a higher rate of victim casualties, and far-left shooters had a higher rate of police casualties. Far-right shooters had a higher number of victim and police casualties overall. A discussion of findings contextualises IMMS threats and explores strategies for countering the phenomenon.