Psychologist say there are three types of people
Healthy self esteem
The victims lacking love at home are looking for love, making them vulnerable.
The bullies being abused at home, are looking to step on someone, to a. fulfill what they perceive to be cool (for everyone imitates their role models) and b. when they do, it temporarily takes away their internal grief, for there is a narcissistic evil desire that gives man pleasure when he steps on someone else (that’s why we all enjoy jokes that make fun of some kind of sub-class, white trash, rednecks etc.)
And last but not least, are those more fortunate souls that their society, family, teachers etc. made them feel good about themselves, so they are looking for more happiness and at the same time they will never be victims.