Why does Jem cry?

Jem cried because of the guilty verdict that was handed down to Tom Robinson. The injustice is just too much to take for Jem. Jem , like his father, believed in the sanctity of the court system. The court was the last bastion of civility; it was the place where things were set right. Jem witnesses the ignorance and hate of the white jury first hand. Despite overwhelming evidence Tom Robinson is still convicted. This gentle Mockingbird has been silenced in the name of racial bigotry and the court must abide by the judgment.

It was too much for him to take so he runs out right Aslan?