Everyone has superstitions. It's part of being sentient in a universe that clearly resents sentience.
IN any case, most people indulge themselves in egocentric fantasies; (this traffic is here to make me late!) and in rare cases leads to schizophrenia, when you wander into the egocentric fantasy world and never come out. So it is no surprise when the dubs, denied the traditional superstitions that satisfy the need for egocentrism, create a bunch of their own.
SOme would say it is harmful, I would just say impossible to avoid...
CZAR