Justice and Rule
Legend
Right?
Murder your way from zero to hero. Perfect.
How about XP for loot instead of murder? Nah. That’s boring.
Slaughter thousands in a war. Perfect.
How about we befriend some of these intelligent beings and try to work out our differences? Snooze.
Invade other people’s homes, kill them, and take their land. Perfect.
Here’s a setting where you fight slavers. How dare you.
Murder happens in the real world. Violence happens in the real world. War happens in the real world. And those are all perfectly acceptable as regular parts of play.
It’s almost like you have to play at a specific frequency of evil for it to be socially acceptable. Any less evil and it’s wrong. Any more evil and it’s wrong. So weird.
I mean, the distinction is easy to make because we have socially-approved instances where violence is justified. Wars kill thousands, but we still find heroes in them. Assault is bad, but self-defense is justified and we have superheroes who take justice into their own hand for the good of people and society. We can put our PCs into those situations where we believe they are justified in the same ways, that they are making decisions regarding violence that wouldn't fly in regular society, but in this case makes them heroes.
There's really no analog to certain things like, say, chattel slavery. At least, none that I can think of.