When asked about it, he doesn't have too many files. What do you do in that case? Isn't he a moron both for storing so much porn and at the same time (somehow) believing a tech support person wouldn't find the root of the problem. It was in a "hidden" folder, so not only he is a moron for the first offense, but doubly so for thinking a competent person wouldn't find something so obvious.
So, I reiterate, most people are morons, and technology just reveals their ineptitude in plain sight, it's simple as that.
You are free to believe in your idealized version of the world, but it doesn't match my experience at all.