The interview with Quassim Cassam raises some of the neglected epistemological aspects associated with the process of radicalization (e.g. indoctrination) and its intricate relationship with violent extremism. In the main part of the interview, Prof. Cassam elaborates in detail on the three main obstacles in this area of scholarly research: (i) the lack of clarity about key concepts; (ii) the flawed assumptions about the nature of radicalisation, and (iii) the flawed assumptions about the nature of causation.