Human Nature in "To Kill a Mockingbird"

In "To Kill a Mockingbird", Harper Lee's general view of human nature is negative. She points out the fact that all people have bad qualities.
One instance in "To Kill a Mockingbird" in which Harper Lee shows the bad in people is when Bob Ewell is at Tom Robinson's trial. He knows that Tom Robinson did not harm his daughter, but he testifies against Tom anyway. Bob swears that he will get revenge on Atticus if it is the last thing he does. This points out the negative in people because all Atticus was doing by defending Tom was doing his job.
Harper Lee calls attention to the human's n…