What does Atticus say about a mob?

Atticus was trying to get across to Jem that a mob, especially in a small Southern town, is made up of people that are your friends and neighbours. Although very disappointing, they are still people and Mr. Cunningham was "still a man". Atticus was very proud of the way Scout handled the situation, she appealed to Mr. Cunningham on a human level and diffused the situation.