You should check in with Joseph Campbell and the "The Hero with a Thousand Faces," (1949), for an in-depth review.
Think of our modern myths: Star Wars, The Lord of the Rings, Stranger Things. What is the everlasting theme? Good vs Evil. That is the background & the playground of our imaginations and lives. We love to read & to watch these narratives because Good always triumphs over Evil. We love these stories, because the stories always end in a very satisfying way. Good is rewarded, Evil is punished.
Of course, in our lives, in our reality, the battle is never over. And we often watch Evil win. It's difficult being a Human Being. We watch as bad things happen to good people, and good things happen to bad people. That's just the reality of our world. It complicates things greatly, no doubt.
We Human Beings have an ever-recurring choice. We are confronted with this choice every damn day. Every breath, every thought, every small & great act we take.
It's not complicated. Sure we live in a complicated, ever-evolving existence. But the fundamental choice is really, very simple. If you are a Zorastrian at heart there is the Threefold Path:
The Threefold Path
There is a Cosmic & Terrestrial war. Because humans are caught in the middle of this war, their primary duty is to support the side of "Good" through a simple but profound ethical framework:
Humata: Good Thoughts
Hūxta: Good Words
Huvarshta: Good Deeds
By living this way, a person actively helps "strengthen" the side of good and works toward the eventual defeat of evil.
We Humans don't need to get hung up on the question of Why? There is a battle in every human heart & head. The choice should be obvious & simple but often isn't. We often watch Evil flourish and prosper and we wonder if that is the way. Sometimes being Good is the more difficult choice. Difficult but essential.
I think we "moderns" realize, despite our myths & stories, that this battle is never over, as long as human beings exist in this Universe, the battle, the choice always exists. This Universe is inevitably both Light & Dark, Order & Chaos, Truth & Falsehood. All those elements are in us too. The drama & trauma is being worked out with every breath we take, every choice we make...