Throughout the ages, stories with certain basic themes have recurred over and over, in widely disparate cultures; emerging like the goddess Venus from the sea of our unconscious.
These days too many of us seem inclined to cover our ears, close our eyes, and blindly follow the most narrow, conservative tenets of religion; or else seek comfort in the ancient traditions of New Age ritual.
The mers were also designed to reproduce only at long intervals, in order to maintain the natural balance of the environment in which they were placed.
Studying anthropology, I developed a kind of holistic view of human existence, in which the dichotomies you listed are all necessary and vital aspects of life.
The futures and ultimate fates of the characters in The Snow Queen are profoundly changed by choices made in their own minds or hearts, as well as choices unexpectedly forced on them by things beyond their control.