This makes Atticus a mockingbird, because he did nothing wrong. Bob uses Tom as a scapegoat for his actions, and it is unjust towards Tom because he is not given a fair trial. In the novel, innocent characters are victimized unfairly in their society. They tried to live their lives or fight for their own rights and equality.
All he did was fight for his rights and the rights for Tom Robinson. This reinforces the injustice Tom Robinson receives from the jury, after both Bob and Mayella lie about what really happened. Injustice is a reoccurring theme in the novel; it shows us the treatment that innocent characters get because of the prejudice and racial attitudes of the society.
Some are blatant and open, but others are more insidious.
The plot focuses on a lawyer, Atticus Finch, and how he defends a colored man, Tom Robinson, who is wrongly accused of raping a white woman, Mayella Ewell.
Racial prejudice is, of course, thoroughly explored in the novel.
However, what originally transpires as discrimination develops into an inferno of injustice, particularly in the debasement and death of an innocent Samaritan, the impoverishment of his family and the humiliation of his race.
The story is narrated by the protagonist, Scout, as an adult woman nostalgically recalling her early childhood over a two-year period.
It is presented with the naivete and youth which characterise the observations of an innocent.
It is truly a testament to the corruption of society when a person who has earned a bad reputation is held in higher esteem than a person who was born with it, as is the case with Bob Ewell and Tom Robinson.
Even though Tom was obviously honest in his testament, the jury sided with Bob Ewell because he was white.