They did this out of respect for what Atticus did to respect Tom. They literally took a stand for Atticus, but they figuratively took a stand in support of what Atticus stood for: respect for all people, the integrity of the justice system, and the Golden Rule. i think that should be good.
I would say the story structure is driven by the very competitive personality’s in the story’s,i also see that many people/persons in the story are very hard working and decatied to what their doing in life!