Working-class people take rules more seriously. Upper- and middle-class people do not. Why? The latter have financial and social safety nets, so they can afford to break some rules.
Research shows that, by the age of three, working-class children are primed to be more rigid about rules. Those rules help working-class people survive what sociologists call ‘hard living’: extreme poverty, dangerous jobs, and unsafe neighborhoods. Having strong rules increases chances of safety and survival.
Why is populism so popular? The rise of Donald Trump has been an enigma to many. Not so much to evolutionary psychologists.