The mythical werewolf is activated by phases of the moon. This is not an unreasonable proposition, unless you deny that tides are controlled by the moon, or that woman's menstrual cycle has a connection to lunar time.
The story of the werewolf is familiar. A friend, a neighbor, a family member becomes transformed into a wolf-like creature that attacks people unlucky enough to cross its path.
Adults don't believe in these creatures. But children do, and with good reason.
Many children have seen a loving and loved adult become a stranger who ravages them in differing ways, either physically, emotionally, or sexually. The beasts these children meet do not grow hair on the face and body, or have paws. But children see them as monsters. They frighten and they make the myth become real.