Stupid people can be very successful and they shouldn’t pursue careers that are open ended with constantly changing abstractions that are beyond their capacities.
he never says stupid - implication?
He doesn’t say stupid, you are mischaracterizing what he is saying. He is saying that if you are slightly below average IQ you will have a very difficult time keeping up with the information processing abilities of occupations that involve rapidly changing abstractions, esp. those such as law, which require high verbal fluidity. He also states that it is not impossible for average IQ persons to be somewhat successful in those positions, as long as they are extremely high in conscientiousness (I would likewise add that someone high in IQ but low in conscientiousness would have a difficult time in long term success).
He is also very clear that a high IQ has absolutely zero correlation with moral wisdom, which is a fallacy that many in our culture tend to buy into.
He is approaching occupation in terms of what is most suitable to a person that will lead to the most successful outcomes, that those occupations are as virtuous as the person who occupies them, and people tend to be more happy and fulfilled with occupations that suit not only their capacities, but also their personality predispositions.