What example of evil did Ansary's religion teacher use In the book of west of Kabul east of New York?

In the book "West of Kabul, East of New York," Ansary's religion teacher used the example of the Nazi regime to illustrate the concept of evil. The teacher explained how the Nazis systematically targeted and dehumanized Jews, leading to the Holocaust. This extreme form of evil served as a stark reminder of the capacity for inhumanity within human society.