To Kill a Mockingbird
Loss of innocence

Songbirds and their associated symbolism appear throughout the novel. Their family name Finch is also Lee's mother's maiden name. The titular mockingbird is a key motif of this theme, which first appears when Atticus, having given his children air-rifles for Christmas, allows their Uncle Jack to teach them to shoot. Atticus warns them that, although they can "shoot all the bluejays they want", they must remember that "it's a sin to kill a mockingbird". Confused, Scout approaches her neighbor Miss Maudie, who explains that mockingbirds never harm other living creatures. She points out that mockingbirds simply provide pleasure with their songs, saying, "They don't do one thing but sing their hearts out for us." Writer Edwin Bruell summarized the symbolism when he wrote in 1964, "'To kill a mockingbird' is to kill that which is innocent and harmless—like Tom Robinson." Scholars have noted that Lee often returns to the mockingbird theme when trying to make a moral point.

Tom Robinson is the chief example, among several in the novel, of innocents being carelessly or deliberately destroyed. However, scholar Christopher Metress connects the mockingbird to Boo Radley: "Instead of wanting to exploit Boo for her own fun (as she does in the beginning of the novel by putting on gothic plays about his history), Scout comes to see him as a 'mockingbird'—that is, as someone with an inner goodness that must be cherished." The last pages of the book illustrate this as Scout relates the moral of a story Atticus has been reading to her, and, in allusions to both Boo Radley and Tom Robinson, states about a character who was misunderstood, "when they finally saw him, why he hadn't done any of those things... Atticus, he was real nice," to which he responds, "Most people are, Scout, when you finally see them."

The novel exposes the loss of innocence so frequently that reviewer R. A. Dave claims that because every character has to face, or even suffer defeat, the book takes on elements of a classical tragedy. In exploring how each character deals with his or her own personal defeat, Lee builds a framework to judge whether the characters are heroes or fools. She guides the reader in such judgments, alternating between unabashed adoration and biting irony. Scout's experience with the Missionary Society is an ironic juxtaposition of women who mock her, gossip, and "reflect a smug, colonialist attitude toward other races" while giving the "appearance of gentility, piety, and morality". Conversely, when Atticus loses Tom's case, he is last to leave the courtroom, except for his children and the black spectators in the colored balcony, who rise silently as he walks underneath them, to honor his efforts.
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