It'd also be possible to have people try to kill you over turning cats into hats with some ethic modifications.
For example: Mistreatment of animals, torture for sport, and not executing/exiling oathbreakers and traitors. All of this adds up, and it becomes very easy for a culture against all that to end up fighting them if they get a suitable catalyst (merchants go missing in the "weird" culture's lands, a diplomat is murdered, that sort of thing.) "These deranged fucks do this, this, and this, and now they've killed our esteemed representative! We must kill them! We must remove these lunatics from the world! And maybe take thier shit."
I also added in anything being done about perhaps being more to do with the leader's personal beliefs, and if not outright fighting, trying to impose a specific way of doing things on closeby neighbors (not just executions, but perhaps trying to influence how theft is treated, or how making trophies from sapients is seen or something,) possibly agitating the owner of the site enough to declare war for trying to impose a foreign culture on thier territory.
In that vein we could have a set of human towns with a large number of people who greatly value nature and feel it should be protected, because they happen to do a lot of trade and are very close to elven territory. Even without direct impressment, someone could still get all uppity and feel they need to "correct" these values be beating the crap out of the source. Varying beliefs on what is considered the "right" way to deal with criminals who got the death penalty would fit into that (there's stuff for oathbreaking, lying, theft, assault, treatment of plants and animals, treason, why not something to cover executions in general? An additional ethic: [ETHIC:EXECUTIONS:UNTHINKABLE] - Such a civ finds it morally repugnant and just plain wrong to execute someone for any reason. Elves and animal people/kobolds would likely get this one since they seem to exile people at worst.)
I admit I'm kinda rambling a bit, but still. It's a little odd to me personally (all of the above is just an opinion on the matter,) that there isn't some tension over how each group perceives the others' sense of justice, and it'd be kind of nice to have some way to vary it besides "chain dude to thing, whack in head with weapon until dead or number of strikes is completed."