" it's now some 35 years I keep seeing intelligent, educated professionals being totally confused by a box of, well wires and stuff, acting like they have been zapped by a 1950ies B-movie MoronRay or something"
Precisely --- they are operating so far out of their comfort zone that they regress intellectually. People who would never dream of phoning up their garage and saying "my car doesn't work" routinely tell me "my computer doesn't work" and I have to play 20 questions, getting only "yes", "no" and "i don't know" answers to each question.
Even when people are specific "I've got a ghost post on Facebook I can't delete" you have to play the game: question 1) "is it the app or in a browser?" (usually answered by "I don't know" or, worse "how should I know?")
So the problem isn't idiots, it's intelligent people behaving like it. However, even that is forgiveable --- the real issue begins when they start to treat *you* like an idiot when you're trying to help them.