To Kill A Mockingbird: Prejudice The Main theme in this book is prejudice. You will learn about segregation and how unfair it was. To Kill A Mocking Bird deals with many primal and basic lessons in human nature. The book exposes many issues that affect most people throughout their lives. Scout, the main character was one of the most affected by these lessons. During the book she was exposed to many profound experiences, which no doubt will leave a lasting impression. In the three years that the book took place, she may have learned the most important things she will learn over her entire life. One person that affected Scouts life wa