How personal significance, collective narcissism, and willingness to sacrifice shape extreme personalities. - Altungy, Pedro; Navarro-McCarthy, Ashley; Lana-Blond, Rocío; Liébana, Sara; Jaume, Luis Carlos; Szumowska, Ewa; Molinario, Erica; Gómez, Ángel; Kruglanski, Arie W. (Frontiers in Social Psychology, 2026)