Measuring extremist archetypes: Scale development and validation.

Previous work has often disregarded the psychological heterogeneity of violent extremists. This research aimed to contribute to a more nuanced understanding of the psychological diversity of violent extremists. Based on qualitative work, we developed and validated the Extremist Archetypes Scale, identifying five distinct archetype dimensions: "adventurer," "fellow traveler," "leader," "drifter" and "misfit." Study 1 identified five dimensions among White majority members (N = 307), four of which were related to extremist violent intentions and which dissociated in terms of sociopolitical ideologies and intergroup attitudes. Preregistered Study 2 (N = 308) confirmed the scale's five-factor solution in another sample of White majority members, replicated relationships with violent intentions, and demonstrated the dimensions' distinct personality correlates. As in Study 1, the archetype dimensions had positive associations with extremist violent intentions and tapped onto different psychological profiles in terms of major personality traits. Study 3 (N = 317) replicated these results in a sample of Muslim minority members. Measurement equivalence was established across gender, age, political orientation, and ethnicity (majority and minority).