Tom and Boo are certainly the main adult human mockingbirds in the story. They exhibit the simple innocence found in the songbird, yet they are men accused of crimes they did not commit who become scorned in the community for their supposed sins. Their lost innocence is not unlike the other human mockingbirds in the story--the children, including Jem, Scout and Dill--and it is one of the main themes of the novel. Atticus, too, can be considered a human mockingbird, though his age and life experiences differ from the others. He is no innocent, having seen his own clients face the death penalty before and suffering life's tragedies such as the death of his young wife. But Atticus does only good for the people of Maycomb, whether as an attorney, legislator, friend or father; yet, his actions are perceived differently by others, and he faces the scorn of some of the townspeople who wish to harm him and his family.