What are the themes in The Kite Runner?

One of the major themes in The Kite Runner is redemption.
When Amir and Hassan are little boys, they are best friends. Although they come from two
different social classes, the boys enjoy playing together and running kites together.
Hassan would do anything for his friend. This loyalty is what causes Hassan to go to the
alley to retrieve the winning kite for his friend Amir. In the alley Hassan is brutally
raped by a group of bullies and Amir stands by and doesn't do anything to help his
friend. Amir feels guilty for his actions and sets Hassan up by hiding his father's
watch. Hassan and his father eventually leave Baba's house, and Baba and Amir go to
America. However, this guilt never leaves Amir and it gets worse when he finds out that
Baba is also Hassan's father. When an old friend from Kabul calls Amir he tells him,
"there is a way to be good again." Although Hassan has died at this point, Amir returns
to Kabul to help Hassan's son and brings him back to America. The novel end with Amir
running kites with Hassan's son. Amir looks at the child and sees the smile of his old
friend. Amir has received redemtion for the sins he committed as a
child.