Consider the role of fate versus agency and the story parent ye consider the role of fate versus agency in the story. What is accidental? What do people control?

Once we have the means to control our fate, in Kino's case the pearl, it is up to us to decide how to use it wisely. Kino wanted to do well for his family, but was blinded when the pearl became more of a liability than an asset. Kino's fate is no accident. He is responsible for what happened to his son because he had the treasure that clouds men's hearts. Unfortunately Kino's fate was written the moment he became consumed by the pearl.