Does "communities" refer to the communites to which the aggressor belongs?

Context:

3. Lack of remorse. The psychopathic aggressor expresses no remorse for the violence inflicted on his victims. On the contrary, a victim’s suffering is proof of his dominant position and serves to increase the internal stimulation he seeks as compensation for his emotional inadequacies.
4. Social polarisation. The psychopathic aggressor’s Weltanschauung is characterised by the idealisation of his reference groups and the denigration of stigmatised communities perceived as a threat. This Manichean socialisation reaches its full measure with the political criminal, whereas it remains at an embryonic stage with the serial killer, hindered by the intensity of his underlying psychological disturbances.