New racism

Here is what passes nowadays for "research"... Those who are not blinded by either ideology will have difficulty setting this apart from the "research" conducted by Nazi scientists and others in the similar strain:
"Despite their important implications for interpersonal behaviors and relations, cognitive abilities have been largely ignored as explanations of prejudice. We proposed and tested mediation models in which lower cognitive ability predicts greater prejudice, an effect mediated through the endorsement of right-wing ideologies (social conservatism, right-wing authoritarianism) and low levels of contact with out-groups. In an analysis of two large-scale, nationally representative United Kingdom data sets (N = 15,874), we found that lower general intelligence (g) in childhood predicts greater racism in adulthood, and this effect was largely mediated via conservative ideology. A secondary analysis of a U.S. data set confirmed a predictive effect of poor abstract-reasoning skills on antihomosexual prejudice, a relation partially mediated by both authoritarianism and low levels of intergroup contact. All analyses controlled for education and socioeconomic status. Our results suggest that cognitive abilities play a critical, albeit underappreciated, role in prejudice. Consequently, we recommend a heightened focus on cognitive ability in research on prejudice and a better integration of cognitive ability into prejudice models. "

While it is to be expected that lower intellectual abilities  and inabilities to distinguish "the shades of gray"  make it more likely for individuals to adopt extremist ideologies, the claim that extremism is limited to the conservative and right-wing ideologies is precisely what is terribly wrong with modern "intellectuals".

An unbiased person has no difficulty pointing out many instances of the "liberal" and "progressive" intolerance towards different opinions, religious convictions, policies etc.

Added later:
Perhaps, my my point will be clearer, if I point out the similarity of this research with the concept of "untermensch", which has earned a rather gruesome reputation throughout the XXth century.