Summarize what happened the night at the jail. How does it end? Does she mean to do it? How do you know?Please keep in mind that this IS all one...

I disagree with the first response that Scout makes the
men "realize what they're doing is wrong."  I think this is rather, a classic case of
"mob mentality."

Scout goes into great detail to describe
what the men are wearing: long sleeved shirts despite the evening heat; those who were
typically in hats wore no hat as evidenced by the tan line seen around their
neck.

What Scout unwillingly accomplishes when she strikes
up a casual conversation with Mr. Cunningham is she identifies him BY NAME.  Suddenly he
is no longer just a face in the mob.  He is in individual.  Granted, everyone knew
everyone in the samll town of Maycomb, certainly Atticus himself recognized the majority
of these men.  But it wasn't until Scout identified him that he realized he was caught. 
Atticus was one man and it would have been his word against a mob.  But the
identification by a child is pretty hard to deny.

This
scene is written to parallel real life activity of the KKK.