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In a sandbox game where players police themselves could you accept the risk of imprisonment for breaking laws by stealing, killing or harming another player inside their territory if defeated?
I ask this because I know one of the biggest things about FFA PvP is that even when players band together to stop gankers they just return. Eventually this leads to apathy of stopping the random killer.
With rule of law given to the community the ability to lock up player killers up I think you might have a lot less random killings. This of course does not stop wars and the like but focus on the random killers.