What is scouts assessment of jems changed behavior after he wont let her kill the roly poly?

Jem doesn't want Scout to kill the roly poly bug because it has not harmed her. It is innocent and defenseless. The theme: "its a sin To Kill a Mockingbird"is reappearing.

Jem says this as he now understands what his father has been trying to teach him. This insect parallels the death of Tom Robinson who had done nothing to Mayella. He saw what society put through this innocent defenseless person. The reason why Tom died was because Tom knew he had no hope he could not do anything about society's ways and that he was going to be killed just because he was a Negro-he was defenseless. Jem didn't want to harm this vulnerable defenseless insect because he now sees it as being sinful.