At Psychology Today Blogs, Pamela Paretsky considers the psychology of political violence. Here’s a bit; follow the link for the rest:
In examining speeches given by leaders of extreme political groups, psychologist David Matsumoto and his colleagues discovered that when leaders invoke anger plus contempt and disgust, their followers are more likely to devalue members of the out-group and respond with violence. White supremacists/nationalists have a long history of devaluing their out-group. As recent events remind us, anger, contempt, and disgust combined with racism, antisemitism, and the rejection of inclusive American ideals is a particularly dangerous and even deadly combination.