. . . It feels crude, illiberal to point out that the other side is, on average, more stupid than our own. But this, the study suggests, is not unfounded generalisation but empirical fact.
It is by no means the first such paper. There is plenty of research showing that low general intelligence in childhood predicts greater prejudice towards people of different ethnicity or sexuality in adulthood. Open-mindedness, flexibility, trust in other people: all these require certain cognitive abilities. Understanding and accepting others – particularly “different” others – requires an enhanced capacity for abstract thinking. . .
Those with low cognitive abilities are attracted to “rightwing ideologies that promote coherence and order” and “emphasise the maintenance of the status quo”. Even for someone not yet renowned for liberal reticence, this feels hard to write. . .
. . . [Former Republican ideologue], Mike Lofgren complains that “the crackpot outliers of two decades ago have become the vital centre today“. The Republican party, with its “prevailing anti-intellectualism and hostility to science” is appealing to what he calls the “low-information voter”, or the “misinformation voter”. While most office holders probably don’t believe the “reactionary and paranoid claptrap” they peddle, “they cynically feed the worst instincts of their fearful and angry low-information political base”.
Conservatism [Reactionism] Thrives on Low Intelligence and Poor Information
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Always Question Authority 