Development trajectories
Definition
Development trajectories refers to the longitudinal, dynamic pathways along which individuals move across ideological positions, behavioral orientations, and levels of involvement in violence over time, rather than occupying fixed categorical states. In the context of violent extremism, this concept draws attention to the fluidity observed among youth, where adolescents shift significantly across ideological profiles and their adherence to the glorification of violence within relatively short periods. A longitudinal study of 574 Quebec high school students found exactly this kind of movement over a single year, with complex combinations of conservative ideologies and glorification of violence appearing in a general population sample. The developmental perspective proposed treats contemporary cases as positions along a continuum, from coherent collective ideological projects through hybridized personal grievances to de-ideologized nihilistic violence, across which individuals may move back and forth. Understanding these trajectories, rather than applying static classifications, is what makes the framework analytically productive for prevention and intervention.
Sources: Rousseau & Veissière (2026)
Related Terms
- adolescence (1 shared article)
- violent extremism (1 shared article)
- Nihilistic violence (1 shared article)
- Ideological hybridization (1 shared article)
Applications
Development Trajectories and Adolescent Radicalization
Adolescence is characterized by especially pronounced movement across ideological positions, making developmental trajectories particularly consequential for understanding radicalization risk. The Quebec longitudinal data showed that exploration of activism and violence as idioms of protest is both common and dynamic during this life stage, which means detection approaches relying on fixed ideological markers risk pathologizing normal adolescent exploration rather than identifying genuine threats.
Sources: Rousseau & Veissière (2026)
Development Trajectories and Nihilistic Violence
Nihilistic violence occupies one end of a developmental continuum along which individuals may travel over the course of their trajectories. Where coherent ideological commitment diminishes, violence itself can become the primary source of identity and belonging, as illustrated by online ecosystems such as the 764 network, and the growing involvement of minors in such networks reflects a generational dimension that static categorical frameworks fail to capture.
Sources: Rousseau & Veissière (2026)
Development Trajectories and Ideological Hybridization
Ideological hybridization is better understood as a feature of developmental movement across a continuum than as a stable categorical type. Individuals draw on a shared symbolic repertoire of memes, historical references, and online narratives with varying degrees of conviction at different points in their trajectories, so what appears as an incoherent hybrid ideology may reflect a moment in an ongoing developmental process rather than a settled worldview.
Sources: Rousseau & Veissière (2026)
