After Atticus gave the kids the air-rifles, he is okay with most of their target practice. Except, he says that "it's a sin to kill a mockingbird." Why
does he say this, and what does it mean?

How does this excerpt develop the central idea that espionage during the civil war was often carried out by untrained citizens? it enhances the reader’s understanding by explaining why training was unnecessary. it changes the reader’s perception of what information a spy was able to obtain. it explains an ordinary person’s motivation for conducting espionage against the enemy. it adds moral complexity to espionage, due to the use of secret and dangerous methods.