I think you are completely wrong on all of this: 1. The game already restricts gameplay to shoot on sight or regret it. And the game does exactly that, punishing you for being not hostile to other players. Adding negative consequences to shooting everyone you see is the only way to break this. And what are you talking about ethics? go meet players anywhere inland and the usual greeting is bullets whizzing by. 2. Making zombies harder to force working together will not work. I would just wait and shoot the other guys after we take down the zombies and we collected all the loot. Either because I want their stuff or to prevent them doing it. The system I propose has no karma, because karma is an illdefined mess. The system allows for a simple measure that will accurately gauge how dangerous you are to other people by a simple average. And more importantly, how helpful you are. You can all claim waht you want, helping others does not pay off, because they can never tell who you are (no identification). And it is not worth the risk risking all your stuff to help people, because if you help 20 people and number 20 shoots you it will ruin your hours or days of gathering with very little risk for the attacker. Killing on sight carries very little risk and a high reward, while not doing that or even attempting to help people carries all the risks and no reward. And if we compare it to real life as the nametag hating people like to do. In real life you would be able to recognize a face. You would eventually seek out people to be with and you would have some inhibitions to kill on sight because being alone will cause depression and insanity aftwer some time. There is nothing polarizing about "proud warrior" because you made up a title that has no defined meaning. "proud warrior" is the same as "asshole that shoots on sight" depending on who you ask.