Jung would refer to the Christ-like protagonist as an “archetype,” or common symbolic icon that arises, perhaps even without intention, in stories and dreams. We have stories of a pure savior, whether Jesus or Superman or Wonder Woman, struggling with the world’s evils, because we need that savior, that icon of goodness. We need to express our own struggle with evil.
When we watch Diana realize that Ares is not all the blame for the world’s evils, when she realizes that mankind is not completely good as she once believed, we see her struggle the same way we struggle when we watch planes fly into two towers or learn of a man shooting a prayer group after they welcomed him. We want a simple explanation for these atrocities and despair when there is none.
But then Diana still chooses not to give up. Yes, there is no simple solution to fixing the world. Yes, mankind does evil and maybe does not deserve saving. But Diana chooses to not let the darkness blind her of the light. Jung would argue, Diana makes this choice, because we need her to; because if she can, then we can. Then by choosing truth and love, there is hope.