Deliberately Stupid People

 Stupid People may be that way for many reasons, and they are not usually aware of it. 

I worked as a Technical Writer from 1980-2000. and was well-paid for it (as much as for a Programmer), because users have to be told how to use the apps they are buying. And they are not usually too smart. 

I was making money out of other people's stupidity. First, the Programmer (or Developer) would explain his program (or app) to me, and I would then explain it to the User. Everyone got happy. Except those who were deliberately stupid.

Instead of getting smart, they got stupid and were satisfied with this state of affairs, that was made especially for them. 

This has forced Tech Writing itself to get better because the Seller wants the Buyer to see how easy it is, using a friendly video. The User becomes Smarter, without his knowing it.