The second part of this study examines the ideological ambiguities and policy implications of the Robinson case, framing it as an instance of “nihilistic-memetic extremism”. This form of radicalisation, where violence acquires ludic and performative traits, challenges traditional left/right classifications and calls for new conceptual frameworks. The article advances original reflections on the role of digital culture in shaping hybrid extremist ideologies and provides concrete recommendations for prevention: enhanced monitoring of online platforms, education in digital resilience, creation of specialised units, and international legal cooperation. Finally, it evaluates the preventive potential of Artificial Intelligence in detecting early signs of radicalisation within dark web ecosystems, while addressing the ethical dilemmas of algorithmic surveillance.