This article challenges linear accounts of jihadist radicalisation by examining the motivations of European migrants to Syria through Karl Mannheim’s concept of ‘utopian surge’. Drawing on sociology-of-knowledge methods, Esmili and Sakhi show that commitment to jihad functions as an existential moral project — a realisation of the self in the here and now — shaped by communal aesthetics and shared ideals whose historical unravelling then drives disengagement. A landmark contribution to the ethnography of violent extremism.