All it takes is for a few evil leaders to promote other evil officers and empower them to perform atrocities without fear of retribution. Some men will then act as evilly as their worst angels will guide them to act, and other men will either follow their lead themselves, or at best, stay on the sidelines.
Islam was built on this principle, from Mad Mo until today. Islam empowers men to act on their worst instincts: rape, murder and enslavement in the name of allah are all condoned if they further the spread of his insane cult.
Compared to Mohammed, Adolf Hitler was an amateur. Hitler’s “Thousand Year Reich” lasted only 12 years and was utterly destroyed, while Islam is still on the march.
The senior officers recruit the junior to do the dirty while covering for them. Oldest trick next to prostitution. We see this arrangment all the time. It’s just a little step to them executing people.