Why Kotler was cruel and ruthless? He killed people because Himmler had told him or he was cruel murderer?
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Kotler is a product of the Hitler youth. He learned to be cruel there. His father is deemed a traitor and it is hinted that his father is a Jew. Kotler would most certainly hate himself for being part Jewish. He would be hiding it all his life. This would explain his violent reaction to Jews in general: Kotler hates himself.