The author of TFA read Charles Murray's Coming Apart and has inexpertly regurgitated (to the extent of just copy-pasting the figures) that book's central thesis

The author of TFA read Charles Murray's Coming Apart and has inexpertly regurgitated (to the extent of just copy-pasting the figures) that book's central thesis while failing to understand its nuance and context. If you're interested in this idea -- and you should be, because it's important! -- then you should just skip the article and read the (vastly superior) book.