Calpurnia is in charge when Atticus is away, she invites Scout and Jem to attend her all-black congregation. In this way keeping Dill symbolizes her loss of innocence when Lula, member of the church, demonstrates that racism and prejudice go both ways. Also, Scout's view of the world is not distorted by racism,therefore she is shocked that anyone could trust the Ewells (white people) over believing Tom's innocence, a black man.
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