Baba also stood up for himself and others when he felt that something was unjustified. Amir never treated Hassan as if he was a true friend, and betrays Hassan multiple times in the novel by not willing to help Hassan and pushing him away.
It becomes understandable that betrayal is a real test of our humanity, tolerance and conformance. Describing their friendship and relationships we can say that Hassan as one of the main protagonists of the novel was loyal to Amir through everything and this loyalty can be explained by the fact that two boys not only were born together, but also were educated as two brothers, not like a servant and master, but like real friends and two different personalities.
One was a binge reader, the other — illiterate. The immense guilt he feels for tending to his own self interests rather than helping Hassan has hindered his ability to live freely and maintain a sense of self-respect.
The problems he encountered were all because of the sin committed in his youth.
Hassan and Ali both do everything in their power to please their masters and remain loyal to them. As the novel continued, Amir attempted to disengage the memory of his sin and forget about it.
The author wrote the book in a way that anyone of any age that reads it can relate to it. The most prevalent guilt that existentially causes the climactic events of the book. Why are different people understand one and the same event in different ways?
He inserts his own stories into the tales he reads to Hassan.
The constant cycle of betrayal and need for redemption fuels the book.