J. W. Goethe was obsessed with "Farbenlehre" [0], which is so weird that it is "not even wrong". I don't think it detracts from his intelligence. It was just his blind corner, so to say.

Intelligent people are sometimes very, very weird. Grothendieck and Gödel come to mind as well. It is not smart to die of hunger because your wife is hospitalized, every lizard knows better than that; but that is precisely how Gödel met his end.

[0] https://de.wikipedia.org/wiki/Farbenlehre_(Goethe)

The example I gave what about Adams being convinced to "know better" while it was clearly not true, which is to me a clue that when it comes to his view on society and business, which already looks pretty simplistic to me, the idea that he "knew better" is more probably the result of him thinking that and managing to convince others people who also like to see themselves as smarter than others.