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Then who is tasked with delivering justice to the victims?
To use the example from a sibling comment, if a person kills a child and the father kills this guy out of vengeance .. it will do those children good, who can now live in safety afterwards from that person.
But if in reality the murderer also had family who did not believe he murdered anyone in the first place now set out to seek justice/vengeance, then yes, it becomes a war .. which is why we have courts and police nowdays, but what justice is, is still rather arbitarily defined. Concretely it means enforcing the law. And laws are written by people.