What does Lee show through Maycomb's lack of concern about Tom Robinson's death?

Maycomb's reaction to the news of Tom's death demonstrates how willingly the citizens interpret the actions of one black person negatively in order to maintain their social construct of subjugating the black population. Scout realizes that the decision to see the world fairly can only occur within each individual's heart, and that there is no way to reach a person who has not become personally convinced of the equality of all races and the virtue of following a moral course of action.