Some of the dumbest people I know have master's and doctorate degrees.

What do they all have in common? Pride. They are too wrapped in themselves to be considered free thinkers. A lot of that has to do with what they are being taught - my brother, who has a master's degree in business, was told that he was one of the best in the world because he got into that specific program. And he completely bought into it. When that happens, you lose any sense of perspective. I know a lawyer, a doctor of philosophy, a doctor of psychology, and even a few psychiatrists who fit that description.