Abraham H. Maslow : “It's a psychological puzzle I've been trying to solve for years. Why are people cruel and why are they nice? Evil people are rare, but you find evil behavior in the majority of people. The next thing I want to do with my life is to study evil and understand it.”
Establish social status
Be cruel to others before they can be cruel to you
Fear people and things that are different
Fear of being hurt/ vulnerable
Lack of full development in the Amygdala, Limbic system (emotional processing) & Prefrontal Cortex (social control, executive function).