Why does scout cry after returning home from the jail? how does jems treatment of scout show his maturity?

In Scout's words, "The full meaning of the night's events hit me and I began crying." As she lies in her bed and reflects upon the events of the evening, most disturbing events, Scout realizes the danger in which her Father was placed, only now comprehending the look in Atticus's eyes. She does not understand the attitude of the townspeople who feel that a white man should only represent a Negro in the most perfunctory manner. When they learn that Attiucus intends to do his best and bring out the truth, the men march to the jail to threaten Atticus, with "the smell of whiskey and stale pigpen" upon them. Those strangers into the midst of whom Scout has jumped, she reflects, were not the men she has seen previously.

Scout's weeps for her loss of innocence, the threats on her father, whom she loves dearly, and for the evil in the hearts of men, men that she has thought she recognized. Hers was a most traumatic experience.