What does Scout mean in Ch. 30 of in To Kill a Mockingbird when she says, "Well, it'd be sort of like shootin' a mockingbird, wouldn't it?"

The quote "To Kill A Mockingbird" is deep and used enough by the major characters of this book, it became the name of the book. In many wonderful stories including but not limited to: "That Was Then and This Is Now," "Just Listen" "The Truth About Forever" and "Dreamland" these authors use the titles many times.

Scout says this kind of ironically; Atticus has said this before, so has Miss Maudie. But, when Scout says it, a man and Atticus are before her. The Man, a police Cop if I remeber correctly is asking her to change her story to say that Boo did kill Bob Ewell. But, she knows that would be framing Boo because he isn't like his neighbors. So, when Scout is saying "well, it'd be sort of like shootin' a mockingbird , wouldn't it?" She's talking about how turning in Boo because he is different is like judging someone because they are different, or as Harper Lee writes "To Kill A Mockingbird..."