In The Kite Runner, Amir recognizes the Talib as Assef. How and why do you think that Assef's experience in jail caused him to join the Taliban?

Assef was a brutal bully with sociopathic tendencies even
as a young teen in the opening chapters of The Kite Runner. He
worshipped Adolf Hitler and hated the Hazara, and when the Russians took over
Afghanistan and jailed many of the upper class, he grew to hate them as well. When Assef
was terrorized in prison, he only learned to hate the Russians even more. The rise of
the Taliban became the perfect outlet for him. The Taliban despised Russians, Americans
and the Hazara--a trifecta that fit Assef perfectly. He wanted payback for his treatment
by the Russians while in jail, and he never forgot his threat of revenge against
Amir--now living in America. Unchecked murder and ethnic cleansing fit Assef's nature,
and his intelligence and leadership ability probably helped his rise in the Taliban
ranks.