Mountain Kitsunes gain their power by frightening people too much until the sadness or anger eventually turns into vengeful intent or hatred that gives rise to their supernatural abilities. They are often depicted as fearsome becase the preyed on humans to gain fear and sadness

the kitsune’s ability to take human form is what allows them to do this so effectively, as it gives them an edge in terms of being able to understand human emotions. Additionally, by pretending to be vulnerable or weak, they can catch people off guard and then strike when they’re least expecting it. none knows why they like to terrify people they might like doing it or they just have nothing else to do with they time