Because that is the theme
Atticus believes that it is a sin To Kill a Mockingbird because they are innocent creatures that do no harm and only bring beauty through their songs. The title of the book could be referencing this idea, suggesting that harming the innocent or helpless, represented symbolically by the mockingbird, is a grave injustice.
Atticus Finch steps into Bob Ewell's shoes in Chapter 22 of "To Kill a Mockingbird" when he confronts Bob after the trial and tries to reason with him peacefully. This symbolizes Atticus trying to understand Bob's perspective and showing empathy towards him, despite their differences.
In Chapter 15 of "To Kill a Mockingbird," Scout and Jem make the faulty assumption that Atticus needs protection from the lynch mob that shows up at the jail. They underestimate Atticus's courage and resourcefulness, as he is able to defuse the situation without their help. They also assume that the men in the mob are irredeemably racist and not capable of reason or empathy.
because that's not the right word to use to describe someone
Atticus Finch says it is a sin to kill a mockingbird because they are innocent creatures that bring joy and do no harm to anyone. He uses the metaphor to emphasize the injustice of harming those who are defenseless and pure-hearted.
Atticus stops the children from sending a letter to the person leaving gifts because he believes it would rob them of their mysterious pleasure in the gifts, and he wants to respect their privacy. Atticus values privacy and wants to maintain the innocence and wonder of the situation for Jem and Scout.
In Chapter 14 of "To Kill a Mockingbird," Jem uses Miss Maudie's help to understand Atticus better by asking her about their father. By opening up to Miss Maudie, Jem starts to see Atticus from a different perspective, realizing his father's integrity and the reason behind his actions. This key moment allows Jem to break through the innocence of childhood and see the world with more understanding and maturity.
In chapter 10 of "To Kill a Mockingbird," Atticus tells Scout and Jem that it is a sin to kill a mockingbird because they don't harm anyone and only make beautiful music for people to enjoy. This is a metaphor for the innocence of certain characters in the novel, like Tom Robinson and Boo Radley, who are unfairly targeted by society despite being harmless. The title symbolizes the idea of destroying something pure and good for no reason.
Atticus says this because mockingbirds are innocent creatures that only bring beauty and joy through their songs. He is teaching his children that it is a sin to harm something that is innocent and does no harm to others. This symbolizes the idea of protecting the innocent and standing up for what is right.
In TKM the pocket watch that Jem and Scout find symbolizes the passing of time throughout the book, and also how Scout and Jem lose their innocence.
Atticus disagrees with Alexandra, emphasizing Calpurnia's role in their household and her importance as a mother figure to the children. He acknowledges Calpurnia's loyalty and devotion to their family, highlighting her irreplaceable role in their lives. Atticus values Calpurnia's presence and sees her as an integral part of their family structure.
Scout is not ashamed of Atticus. In the beginning of "To Kill a Mockingbird," Scout is embarrassed by Atticus because he is older and doesn't do the things typical fathers do. However, as she matures, she comes to admire and respect him for his strong moral compass and his willingness to stand up for what is right.
The sickening comic aspect of Atticus's exchange with the mob of men in "To Kill a Mockingbird" is that despite the serious threat and tension of the situation, Atticus remains calm and composed, using humor and reason to deflect the aggression of the men. The absurdity of a lone man facing a group of angry individuals with nothing but his words creates a sense of dark humor in the scene.