Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it. - Laurence J. Peter

Incompetence plus incompetence equals incompetence

Three Observations 1) The computer may be incompetent in itself — that is, unable to do regularly and accurately the work for which it was designed. This kind of incompetence can never be eliminated, because the Peter Principle applies in the plants where computers are designed and manufactured. 2) Even when competent in itself, the computer vastly magnifies the results of incompetence in its owners or operators. 3) The computer, like a human employee, is subject to the Peter Principle. If it does good work at first, there is a strong tendency to promote it to more responsible tasks, until it reaches its level of incompetence.

Occupational incompetence is everywhere. Have you noticed it? Probably we all have noticed it.