The right wing does it all the time.
53% of all prisoners are black, ergo blacks are criminals.
Homosexuals represent 70% of all HIV infections, ergo homosexuality is inherently risky and should be treated the same way as hard drugs.
Now Thomas Sowell doesn't say any of those things himself. His points are much more interesting ... to people who have been only exposed to the liberal side of the story for their whole lives.
To someone who has read the original red in tooth and claw conservative talking points from the 80s his books are just a rear guard action and a not very interesting one at that.
Which is why the success of Thomas Sowell with people who have gone to university and then exposed to the real world is entirely the fault of the people who cancelled racism/sexism in the 80s/90s and are trying to do it again today.