It's all by accident. It's his environment what creates man. Nobody can choose on the start where he would find himself. Stupidity mostly occurs as unrestrained pursue of monies. Businessmen will call everything afflicted that is not only gaining another article - to get more articles from it then.
Wisdom is mental disease, stupidity is mental deficiency.
Stupidity is perfectly hermetic. You can't make a fool wiser. He can't be taught just because little he knows. Unlike a psycho, a fool is not a child. If a child can't understand something, he strives to learn it.