That's our myths, not science. These unfounded beliefs can be very confining. Likewise, many of our opinions about life in general reflect our cultural inheritance, the stories and assumptions we are told and believe, not what we have experientially or experimentally found to be true. Chinese eat dogs, we don't. Certain Indians destroy wealth, we covet it.
Some families expect to be wealthy leaders, others expect to be poor.
If anger and violence are used by parents to threaten children and by heroes on TV to right wrongs, the children will use angry threats to intimidate other kids without investigating what works best. We live submerged in a sea of unproven beliefs. Myths, like therapy, books, and dreams, can be used to gain insight into our unconscious motives, needs, fears, wishes, conflicts, etc. It may be a stern, demanding, physically threatening male. In the myth, the hero or heroine overcomes these obstacles, gains esteem and spiritual power, and generally improves and enriches the world.