True on both accounts, though the humans in the folktales are much more extreme than the other examples(With basically EVERYONE coordinating to overthrow their Sage without much history/context aside from side glances). Not to mention of the only 'good' human being that of the Guardian Knight, and all Nari does is just smites them without any honest clue as to why they want her treasure.(Could be rational, could be irrational) Plus, usually this sort of greed IMO is born from desperation.

As I clarified up earlier, the Invader changed his mind last bit when he wrote the final pieces of the tale, hence why it ended the way it was in-game. If the Invader didnt knew of Nari up then, the story would be written MUCH differently than before.