True that's why I suggested perhaps a flipside reward to killing such as coming upon a survivor who is being held by bandits, if you rescue you him there could be some kind of reward. Although killing people is still a lot easier and more common, perhaps there would rather be a chance to receive a trophy when killing someone to make it more balanced. If this was cosmetic as well it could be something flashy perhaps a headpiece or mask that would shout "Hey I'm a mass murderer!" so when you see this person out in the field it would trigger you to want to KoS.