While I don't disagree with this in principal, it's important to distinguish between stupidity and ignorance. Most people don't know about OSes because they've never needed to learn more than how to do basic tasks, and so are ignorant of how they work, what alternatives are out there, and why someone might choose one. This is very different to being incapable of those technicalities if shown a good reason to do so.

I always think about the effort to create a bear proof trash can in Yosemite that gave us the phrase “there is significant overlap between the smartest bear and the dumbest tourist”.

gotta add the babbage classic :

On two occasions I have been asked, — "Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?" In one case a member of the Upper, and in the other a member of the Lower, House put this question. I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question.

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.

https://www.schneier.com/blog/archives/2006/08/security_is_a_t.html

"There is considerable overlap between the intelligence of the smartest bears and the dumbest tourists.”

Adams was truly a modern philosopher of great note.