Scout learns to "stand in other people's shoes", as Atticus says. She learns to try to see things from those people's perspective. She doesn't get to see Tom before the trial. Then she sees that most people don't even take into account the fact that Tom is disabled. At that trial, Scout sees how black people are treated, and how they are punished for being different. Bob Ewell is the obvious villain of the story, and there is strong evidence against him, but it is not enough, as he is no different from others - he is white. As for Boo, Scout first imagines him as a monster. Only later, when he saved her and other children from Bob, she understood that he is a normal human being, although a bit awkward and reclusive. When she saw the street from his porch, she understood that he was their protector all the time.
