Well, the vast majority of RPG has leeengty chapters just about how to kill people, so what do you expect my players do?
Being a bunch of cold-blooder killer bastards, that's. The fuckers.
Which stands to reason that if you want a game that is violence-free (though not necessarily conflict-free) then you need to reduce the number of pages allocated to killing and maiming in the game. And, to be honest, it also stands to reason that games traditionally appeal to a small section of the population.
The traditional game, D&D, brings you a setting where it is assumed that you will wander the cuntryside, robbing tombs, killing wildlife and murdering other intelligent beings. It's no wonder that I never liked it.