6. I've been pushing Altemeyer's ideas & free online book around here for years.
His work is an outgrowth of the old Adorno et al. work on authoritarianism done after WW2 that resulted in things like the California F Scale. Where the Adorno crowd delineated the characteristics of the followers, Altemeyer focused more on the psychological characteristics of the leaders. The leaders and the followers are not the same kind of people.