This is a film about caring for other things than what is yours just because it's right - the kind of things that humans are capable of when circumstances allows them to be so.
Would a couple today care as much for a strange child? Somehow I doubt it but maybe these times will return with a vengeance now that capitalism is being seriously questioned.
Anyhow, the story is surprisingly complex and just as you think you know how it will all end there is still a twist in the end adding to the complexity of the story. It is almost as if there is an idea being presented instead of just a story.