As previously stated, the most important lesson taught in To Kill a Mockingbird is how it is a sin to kill a mockingbird. This is shown in the book when the police officers killed Tom Robinson. Tom Robinson was considered a mockingbird, because his purpose in life was to help people and work. However, his life was cut short when the police officers shot him. It is a sin to kill a mockingbird, because they are innocent and never hurt a soul.
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