OK, first of all they've got it backwards. People who have trouble thinking may have extreme views. If they are fearful and feel that nothing they do can positively affect their lot in life, they tend to develop extreme views. "The Man is holding me down", "It's because I'm not pretty enough", "Other people inherit their wealth", "vast right/left wing conspiracy", "white/brown/black privilege", etc. Excuses as to why they are not able to succeed rather than attempting and risking failure.
And, secondly, this is much more prevalent nowdays, because "metacognition" aka "thinking skill" is actively discouraged in pretty much all walks of life, including schools, churches and the media. And, for many people, that active discouragement worked very well.