Catharsis is the act of purging stress and tension. Most commonly used in psychiatric diagnosis, it is also demonstrated to absolute effect in the movie The Purge.
Intersectionality is the nebulous web of privilege and discrimination that is the crux of social justice/injustice, and protoculture is the passing of behaviors from one generation to the next among non-human primates
The local band of 'nasties' (goblins / orcs / whatever) lives in relative peace with the local population.
Along come the PCs and go through their usual heroic monster bashing routine, wiping out the nasties and pinching all their stuff, then continue on their way.
Problem is, they don't kill ALL he nasties. The survivors want revenge and, after spending a few months recovering, start to take it in their own inimitable style (which is not unlike that of the PCs come to think of it).
Next time the PCs are in the area they find themselves VERY unpopular with the townsfolk.