Some of the most interesting and compelling analyses for a reader when exploring a novel is how all elements contribute to a character's growth or demise, but ultimately, some form of change occurs. When exploring this particular question, it's important to understand the concept of perspective.
Through all the events of the novel, it is Steve's own perception of himself that goes through the most change. The author explores this concept by giving the reader multiple perspectives of Steve that the character must balance and grapple with, consequently showing to the reader that people are dynamic: constantly changing, adapting, and adjusting based on the world around them and the circumstances they find themselves in.
Steve's view of himself as an innocent person counteracted by the view of society and the view that the prosecution takes toward his presumed guilt eventually amalgamates into his own perception of himself. In order for Steve to understand his own identity in the wake of these events, he looks not only within himself but to his outward identity that others see and judge.