Defeatist? How? We don't just put anyone in a vehicle, they have to have a license. That's a bit much for a computer but what is wrong with having to learn?
Often that just seems like an argument used to justify poor UX. There is nothing wrong with learning but many people have other interests and/or prefer/have to spend their effort on learning other things.
Outright dismissing them as "too stupid" seems a bit elitist especially if you want them to user your software.
