I'm against any karma system or anything to punish "bandits" (or reward heroes) as it will be unrealistic. Remember it's a post-apocalyptic world. If players want to have a safer environnement they'll have to create it themselves. by creating guarded zones (and I'm not talking about "god mode zones" like in the mod), alliance and stuff, and also bases (when they will be introduced). Now maybe there should be a way to identify player as in real life you can identify people with their size, face, scars and stuff. So maybe if they want to introduce a system where you can recognize people when you're like 50 meters away from them or closer (getting their name, or an ID or anything, which you could partially conceal with clothes). But again to be realistic it should be approximative, as it is in real life...It's pretty hard to describe someone and be 100% sure . That could allow players to create some kind of a bounty hunter system (again, on their own). And also, as already suggested, increasing the number of zombies (and make them really attracted to noises) could make you think twice before fireing but I think it's already being worked on and they want like 10'000 zombies per server (Officiel anouncement : http://forums.dayzgame.com/index.php?/topic/156129-confirmed-upcoming-features-for-dayz/) But then again : it's a post-apocalyptic world, the goal is to survive and you do that by avoiding problems, being sneaky and very cautious. And we're lucky it's a game and we can post on forums to ask for partners and help