Because of a strong instinct for economic self-preservation. There are very sharp limits on emotions you can show in the workplace -- hence, the smile-button expressions that are standard wear for corporate work. There is a wonderful passage in Joseph Heller's Something Happened (the Great American Business Novel) that goes something like this: In every office there is someone who is slowly going crazy. That person is imperceptibly isolated as a deviant and shunned, and eventually -- quietly and smoothly -- eased out of the company by superficially solicitous human resources personnel and forgotten.
Carl
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