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THE BASIC LAWS OF HUMAN STUPIDITY

by Carlo M. Cipolla

1 - Always and inevitably everyone underestimates the number of stupid individuals in circulation.

2 - The probability that a certain person be stupid is independent of any other characteristic of that person.

3 - 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.

4 - 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.

5 - A stupid person is the most dangerous type of person. A stupid person is more dangerous than a bandit.

(via ContraFactos & Argumentos, versão integral aqui)