Briefly summarize Jem and Atticus's discussion about the legal system in chapter 23 of To Kill a Mockingbird.

Jem and Atticus are discussing the recent trial and unjust conviction of Tom Robinson. Jem does not think it is fair that Tom was sentenced to death for rape; even if he was guilty, he should only have received a prison sentence. Atticus helpfully explains that there is no way that a jury in the South would find a black defendant guilty of such a charge but only send him to prison. He goes on to discuss the importance of reasonable doubt in cases such as Tom's. Jem may be young and relatively naive, but even he knows that there was more than just a hint of reasonable doubt in Tom's case. Yet the jury still convicted him. This leads him to conclude that juries should be abolished. Atticus suggests that changing the law would be a better idea.
Moreover, the problem in Tom's case was not the jury system; it was the individual jurors themselves. They had found Tom guilty before they even set foot in the courtroom. Jem wonders why folks from Maycomb like Miss Maudie never get to serve on a jury. Much to Scout's disgust, Atticus tells Jem that women are not allowed to serve on juries in Alabama. Also, he says that folks in Maycomb are too deeply involved in other peoples's business to make the kind of impartial decisions called for in jury trials.