Another possible factor: some people suffer from a kind of "error blindness", when the computer shows them some text, even really simple text, they don't seem t

Another possible factor: some people suffer from a kind of "error blindness", when the computer shows them some text, even really simple text, they don't seem to be able to see it, almost like their optic nerve is censoring the text. You can write your program so that on error it shows a message like: "Push the red button" ... and many users will just stare at the screen and proclaim "I don't know what to do, what's wrong with it? How do I get back to the thing?"