Every biological behaviour has a survival benefit component for the enactor, or else it becomes a waste of time and energy. I want to identify the benefits to “power through violence” seeking groups. Enforcing Parasitism? This may not work so well when the people being terrorised and harassed are also living on the margins and equally desperate. People and groups living on the margins learn to cooperate and share resources, where this has benefits. Chaos created by parasitic groups makes their own environment unsupportive.