How do good and evil coexist in To Kill a Mockingbird? Include examples from the story when discussing this theme.

The coexistence of good and evil is absolutely a prominent theme in To Kill a Mockingbird. The town is a perfect example of this. Prior to the division brought because of the issue between the Ewells and Tom Robinson, the good and evil natures of people coexisted rather well. However, this coexistence gets upset when Tom Robinson's case comes about. Those who hold racist beliefs are willing to defend the Ewells who are white, even though it is clear that Robert Ewell is the one who caused harm to Mayella Ewell. Tom is clearly shown to be innocent, but he is condemned guilty because of the color of his skin. The evil that exists is racism. The good comes in the form of Atticus. He chooses to put himself in danger to defend Tom.
The other place that good and evil coexist is within each individual man. When Atticus goes to sit in front of the jail to protect Tom Robinson from a mob of townsmen, Scout, Jem, and Dill follow him. Scout's innocence and kindness appeal to the humanity in one of the mob members, Mr. Cunningham. This diffuses the situation, and everyone goes home. The next day, Scout asks Atticus about the event.

“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.”

Even within the individual characters, the theme of the coexistence of good and evil plays out.