The idea is simple: People who are incompetent are also not competent to measure their own competency. Got that? In other words, people who are ignorant -- I mean really ignorant -- are less likely to see themselves that way and are more likely to fight for their mistaken beliefs. And the Internet has taken this effect to a whole new level because now we can have global discourse in which nobody involved knows what he is talking about. (PBS)
From an article on Microsoft's recent court behaviour