What are some sins that character make in the kite runner apart from Amir

Some terrible "sins" take place in this story. Of course the word "sin" is a relative term. I think if you mean in a general moral sense I could mention a few from memory:

-Assef, the local socio-path beats Amir nearly to death and rapes Hassan.

-Amir fails to protect his friend Hassan.

-General Taheri

Soraya's father. He is a former general who prefers collecting welfare to lowering himself to a blue collar job.

-Soraya

Amir's wife. She shamed her family as a young woman by running off with a man.

Those are only a few but we must remember than "sin" can mean different things in the context of different belief systems.

Can you please answer this: How do they confront them (sins)?