Anyone interested in psychology should do phone support for a few weeks...
My guess is that they dismiss error boxes too quickly, or work ahead of you and are afraid that you'll figure it out if they tell you what their error box actually says, and they'll get an F on the test and will have to go to summer school.
The problem is that once trained, people start doing it instinctively, even with the people that can actualy help.
There are plenty options that can bug your browser or leave you unable to surf, why remove this particular one?
If you think users aren't that stupid, you're wrong, they are that stupid. If you think people should not use the Internet if they don't understand that much, then you're suggesting kicking a large chunk of the population off the Internet. If you work in IT, kicking a lot of people off the Internet is a surefire way to reduce your industry's size.
Not if someone borrowing your computer for 5 minutes disables it.