Why do people bully?

What is bullying? Bullying is the use of force, threat, or coercion, to intimidate or aggressively dominate others. Bullying in Australian schools is rampant as bullying is a behaviour that is often repeated and habitual. Behaviours used to assert such domination can include verbal harassment or threats, physical assault or coercion, and such acts may be directed repeatedly towards particular targets. Rationalisation of such behaviour sometimes includes differences of social class, race, religion, gender, sexual orientation, appearance, behaviour, body language, personality, reputation, lineage, strength, size or ability. If bullying is done by a group, it is called mobbing.