There are several themes shown in Chapter 15 of Harper Lee's To Kill a Mockingbird.
A theme is a message, or life truth, which the author is trying to share with the reader, by way of a piece of literature. In this novel, there are a number of themes. Among them are "prejudice and tolerance," "knowledge and ignorance," "courage and cowardice," and a man's humanity—regardless of color.
The chapter begins when men from town come to Atticus' home—worried about Tom Robinson. In them we see the positive aspects of each of these themes: tolerance, knowledge, courage, and humanity.
The men come to Atticus's home—this indicates forthrightness about their actions. They do not sneak, but meet Atticus in a civilized manner. They are honest and courageous enough to speak to Atticus directly. And while there may be tension in the discussion, there is no danger.
"...moving him to the county jail tomorrow," Mr. Tate was saying. "I don't look for any trouble, but I can't guarantee there won't be any..."
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