I'm reminded of that landmark paper: _The Basic Laws of Human Stupidity_ by Carlo M. Cipolla, Former Professor of Economics at University UC Berkeley.

-First Law: Always and inevitably everyone underestimates the number of stupid individuals in circulation.
-Second Law: The probability that a certain person be stupid is independent of any other characteristic of that person.
-Third (and Golden) Law: A stupid person is a person who causes losses to another person or to a group of persons while himself deriving no gain and even possibly incurring losses.
-Fourth Law: Non-stupid people always underestimate the damaging power of stupid individuals. In particular non-stupid people constantly forget that at -all times and places and under any circumstances to deal and/or associate with stupid people always turns out to be a costly mistake.
-Fifth Law: A stupid person is the most dangerous type of person.
-Corollary to the 5th Law: A stupid person is more dangerous than a bandit.

Paul