The author himself has cognative bias. He ignores obvious problems that have corsened American life: increased racial tension, not reduced; suicide rates; failure in public education; political violence, etc. His emphasis on relativism is misleading. For example, todays riots are not as bad as the sixties. Ridiculous reasoning. Of course technology has advanced dramatically - always does. But there's a downside to like obsessive texting, deranged tweets, etc. Ever hear of drug addiction? He obviously has a left wing bias. OK, but no objectivity, and I'd question his expertise.