"Revenge, at first though sweet, bitter, ere long, back on itself recoils"
The law in this new world is weak. The only justice to be had is at the hands of victims incited to action or bystanders willing to fight for their fellow man. Revenge eliminates the ethical dilemma of murdering a guilty criminal while in possession of evidence against them. Murdering your fellow player with Revenge is still considered a crime and will leave evidence of the act.