My conclusion is that a distrust of expertise and evidence is a cultural theme that isn’t based on the performance of those methods. It’s based on something else - maybe declining social cohesion or the easy fabrication of information on the internet.
If humanity's average IQ is declining, I don't think as of 2020 the decline's magnitude is all that significant in terms of the number itself.
This is not to say that declining average IQ doesn't factor into
"something else." www.nbcnews› think › opinion › iq-rates-are-dropping-many...
May 22, 2019 - In a host of leading nations, IQ scores have started to decline. ... evidence of social progress, palpable proof that humanity was getting steadily ...
Are IQ scores going down? What researchers say about ...
slate.com › 2018/09 › iq-scores-going-down-research-flynn-effect
Sep 19, 2018 - IQ scores look to be on the decline. ... We're just as drawn to other signs and symptoms of human degeneration, as expressed in trendlines ...
IQ scores are falling and have been for decades
.cnn. 2018/06/13 › health › falling-iq-scores-study-intl
Jun 14, 2018 - IQ scores have been steadily falling for the past few decades, with ... driving the decline in IQ scores, according to the study, published Monday.