What does Scout teach Dill about the processes of the courtroom?
Scout explains the attitudes of the attorneys to Dill. He is upset and crying over the way Mr. Gilmer treated Tom on the stand. He says he just doesn't understand why Mr. Gilmer had to be so cruel to Tom, and Scout does her best to explain it to him:
"Dill, that's his job. Why, if we didn't have prosecutors-well, we couldn't have defense attorneys, I reckon."
Dill exhaled patiently. "I know all that, Scout. It was the way he said it made me sick, plain sick."
"He's supposed to act that way, Dill, he was cross…”
"He didn't act that way when-"
"Dill, those were his own witnesses."
"Well, Mr. Finch didn't act that way to Mayella and old man Ewell when he cross-examined them. The way that man called him 'boy' all the time and sneered at him, an' looked around at the jury every time he answered---"
Scout explains to Dill that both sides want to win, and they're doing the best they can at their jobs. Dill remains upset, however, until Mr. Raymond speaks with them. This incident reveals Dill's sensitive and compassionate nature.