Violent extremism in the United States is not an aberration but a constitutive, historically rooted phenomenon. While often framed as a psychological or ideological pathology, extremism has long been socially, culturally, and politically embedded. Reactionary violence—from Indian removal, slavery, and lynching to the Ku Klux Klan, militia movements, and contemporary mass shootings—has dwarfed radical extremism in scope and impact. Extra-legal communal violence, weak state monopolies on force, and complicity of officials have sustained extremist traditions. For educators and psychologists, recognizing this historical legacy is essential for addressing the enduring psychological, emotional, and social consequences of extremist violence today.
Brundage et al. (Sat,) studied this question.