It’s a power play. Having a word that you can say, but others, under penalty of termination and ostracism, dare not utter, demonstrates that you have some power

It’s a power play. Having a word that you can say, but others, under penalty of termination and ostracism, dare not utter, demonstrates that you have some power over them and raises your status. (Some people don’t grasp this dynamic and take the stated rational for the prohibition at face value.)