Reply #5: You can do it in subtle ways

[NewJeffCT]

players that stick up for the weak & downtrodden get a bonus to XP - sometimes players tend to treat the random townspeople or caravan guards as "cannon fodder"

but, in the real world, you can be a pacifist and a peace lover - but, it's kind of hard to do that in a world where things like demons and dragons are real and the undead stalk the lands.