Adolph Hitler was incredibly crowd pleasing, with a certain kind of crowd, with a certain kind of attitude in a crowd.
The same Japanese rice farmer in 1942, the same Ohio corn farmer in 1942, can go through very similar school of military boot camp and become killers / murders of each other when they meet on islands near Japan.
Military leaders have a killer instinct or education at military schools. Dehumanization is trained and educated in a way similar to clergy education of Torah / Quran / Bible at the Church / Mosque / Synagogue.