"I thought Mr. Cunningham was a friend of ours. You told me a long time ago he was." "He still is" "But last night he wanted to hurt you." Atticus placed his fork beside his knife and pushed his plate aside, "Mr. Cunningham's basically a good man," he said "he just has his blind spots along with the rest of us." Jem spoke. "Don't call that a blind spot. He'da killed you last night when he first went there." (Lee 179)
Jems reaction reinforced what an older audience should understand because we understand that although people have different opinions, is doesn't mean you should harm the other person because of it, and that is essentially what Jem is saying here. He's basically saying that it's not an area that should be given forgiveness, because it should be common sense not to harm Atticus because of what he is doing.
Scouts reactions shows how clueless of what's going on she is. She doesn't realize why Mr. Cunningham was trying to hurt Atticus, so Atticus tries playing it off by saying he is a good man, and just making a mistake. This gives a different understanding because we a a different point of view that knows absolutely nothing of why people are trying to hurt her father. It is important that we are hearing this from Scout's point of view, because we are seeing that alothough racism was a huge problem, it was seen normal to a kid like Scout. She has no clue that because her father is the lawyer to a black man, people want to hurt him, she sees no connection to that.