Being fairly new to GMing I am having trouble with keeping my PC's from turning on each other, and every thing in sight. It doesn't matter how much I punish them for killing obvious allies, or clarify that certain wounds are not going to make a PC turn. The first and only reaction is kill everything, trust no one. As such our Games rarly last more than a session. Any ideas on how to keep a group together while still keeping that survival need up?
I should clarify that this is a zombie game. The killing of the same zombies over and over again is quite boring, so the interest must be kept by the interaction with NPCs, handling of wounds, searching for needed items, and the like.
The problem I have is that my PCs will instantly kill any NPC that seems to threaten them. Thus I must make the NPCs clearly black or white, with no option to add interesting story elements in the interaction.
Secondly, they are way too fond of killing each other. I devised a very careful senerio, where the story is driven by the interaction with people who have been wounded, but my PCs just want to kill anyone that has been injured. As such, they cannot learn about the particulars of the illness, or how to cure it. Instead, they just kill the wounded person and pick a new PC from the pool of survivors.
I have tried to curb this by punishing them for the killing. However, they just seem to think this is part of the survival mechanic, and are starting to get mad at me for making the game too hard.