One of the main predictors for the violent actions in terrorism and extremism is the process of radicalization (LaFree 2013). Radicalization is generally defined as the process of transition from non-radical actions (i.e., non-violent forms of expressing opinions, ideas, behaviors) to radical actions (i.e., the violent forms). The key aspect of this transition is the acceptance of violence as the main means to achieve political, religious, ideological, or even personal goals. Radicalization is frequently used in studies of terrorism; however, it is rarely used in studies of school shooting. In the context of mass school murders,