How personal significance, collective narcissism, and willingness to sacrifice shape extreme personalities - Altungy, P.; Navarro-McCarthy,A.; Lana-Blond,R.; Liébana,S.; Jaume,L.C.; Szumowska,E.; Molinario,E.; Gómez,Á.; Kruglanski,A.W. (Frontiers in Social Psychology, 2026)