Comment by hungrygs

Just anecdotal, but my life observation of DK is often highly intelligent and competent people in a particular field who then generalize that to pontificate and proclaim, directly or indirectly, superior understanding to certified domain experts (e.g., have directly related advanced degree(s), work in the field for decades.) It thus seems more or as much a psychological effect - in short, people with a personality type of superiority and know-it-all, yet have never done the deep and hard work to gain or demonstrate any competency in said areas. A common side observation is of course unfounded conspiracy theories, that the derided experts have sinister intentions.