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1. An incompetent person is the most dangerous type of person (far more than malicious people and even enemies) 2. Always and inevitably everyone underestimates the number of incompetent individuals in circulation.
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3. The probability that a certain person will be incompetent in one area is independent of any other characteristic of that person, including competence in other areas
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4. Good people always underestimate the damaging power of incompetent individuals. In particular good people constantly forget that at all times and places and under any circumstances to deal and/or associate with incompetent people always turns out to be a costly mistake.
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The stupid version and the incompetent version have different meanings and appeal to different groups of people. Both sets have value, I think. The stupid version is already there in the link. So putting out the incompetent one.