Or, in the words of Bertrand Russell, "The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt."
I've wondered if the reason is because ignorance tends to create a very low resolution of reality, so it is easy to grasp, master, and "know everything" in that imaginary world they have created in their minds. Once perception opens up to the complexity of the truth of reality, then suddenly one is overcome with his own inability to comprehend. It is frightening to realize that in the face of all of reality that I, as a human being, am actually a dumb-ass with extremely limited control over any outcomes.
To use a metaphor: It's much more reassuring to think literature is just the alphabet and feel like you are on the same level as James Joyce for being able to recite the alphabet backwards.
The first man to raise a fist is the man who's run out of ideas. H.G. WELLS
The first principle is that you must not fool yourself, and you are the easiest person to fool. FEYNMAN If this is monkey pee, you're on your own.SCULLY
When I was going through my separation and divorce I would call my step-mother to vent. She was an amazing source of support. On several occassions, she would stop me in mid-sentance and say...M*******? I would pause and answer...What? She'd say do you know who you sound like right now? I'd say No, who? She'd give a long pause and answer: Your father.