In "To Kill a Mockingbird", why does Lee use Miss Maudie to explain Atticus’ role in the community?Chpt 22

By chapter 22, Miss Maudie is firmly fixed in the mind of the reader as a reliable person. She is the female version of Atticus. Miss Maudie does not react with emotion; she reacts with reason and intellect just like Atticus does. No one understands Atticus better than she does, not even Atticus' children or his sister. When she tells Jem that Atticus is one of those men who are chosen to do our unpleasant tasks for us, we believe that she knows precisely what she is talking about. She goes on to explain to Jem that Judge Taylor chose Atticus to represent Tom, knowing that Atticus would lose the case, but also knowing that Atticus would try his best to do the job and do it right.