Another example of Jem's dissatisfaction with the jury's verdict in the Tom Robinson trial comes at the beginning of Chapter 22.
It was Jem's turn to cry...
"It ain't right, Atticus," said Jem.
"No son, it's not right."
Having watched the entire trial, Jem had the chance to make up his own mind based on the testimony given. To him, it was a no-brainer: Tom was innocent. Later, he asks Atticus, "How could they do it, how could they?" Atticus responds that it won't be the last time--
"... they'll do it again and when they do it--seems that only children weep."
In Chapter 23, after Atticus has been threatened by Bob Ewell, Jem learns that one of the Cunninghams has been the holdout on the jury.
"Golly Moses," Jem said reverently. "One minute they're tryin' to kill him and the next they're tryin' to turn him loose... I'll never understand those folks as long as I live."