If I do know why mockingbirds are a central metaphor, I don’t know how to explain it. One possibility is that what it represents could be a major theme from the book.
I can only think of two ideas about what that quote means. My first idea is that mockingbirds represent the African American race. Stating that all that mockingbirds do is sing their hearts out could be reference to te church scene. My other idea is that mockingbirds represent the children. This is because mockingbirds repeat sounds from other things. An example in the story similar to this is when Scout talks to Atticius and she keeps on saying “nigger”. Atticus tells her not to use the word. She was using the word because other people were using it at school.
The incident between Scout and Uncle Jack is an example of the importance of point of view because he would of made a mistake if he did not think about Scout’s point of view at all. It shows how by being inconsiderate by not not respecting or listening to others viewpoints treachery in the world might go unjustified.
I think that point of view will play a big part in the Tom Robinson case.