ABSTRACT Rehabilitation programs for terrorists have gained notoriety. Some issues still require thorough investigation, such as the social support they receive. The present research aims to examine the attitudes towards rehabilitation programs for terrorist offenders and the mediating and moderating mechanisms underlying these attitudes. To this end, two studies were conducted: the first study evaluated the mediating mechanisms (negative feelings and threats; N = 407) and the second study analyzed the moderating mechanisms (social dominance orientation, system justification, and political orientation; N = 444). In both cases, the type of offender was manipulated (criminal vs. nationalist terrorist vs. Islamist terrorist offenders) and different attitudes were assessed (general support, incapacitation, treatment effectiveness, and mandated treatment). The results showed less support for rehabilitation programs for Islamist terrorists than for other offenders. Moreover, Islamist terrorists pose a more significant terrorist threat while criminals pose a greater realistic threat, which led to less favorable attitudes towards rehabilitation programs. Finally, individuals with more conservative ideologies had stronger negative attitudes towards programs for Islamist terrorists. We discuss these findings within the framework of integrated threat and system justification theories.