The so-called "evil" is very subjective: if this god obeys you, but will hurt others infinitely for your own good, as a vested interest, will you think she is "evil"? In "The Curse", Hei Mu obviously has such an inclination to the Chen family, especially to the heroine: she basically doesn't attack her (not to mention being scared), but attacks all objects that hinder her connection with Hei Mu.
Generally speaking, religious workers job email list judge whether a ghost or spirit is "evil", not from their ability or the offerings they receive, but from their "judgment ability", that is, their moral outlook. If a ghost or spirit is powerful, but has no basic "judgment ability", and looks at the problem very emotionally with "those who obey me prosper and those who disobey me perish", this is generally a "evil god".
In fact, ghosts and gods "deeply need" psychological counseling, especially ghosts and gods with more powerful abilities. They are often in a "stupid" period just like human beings at certain times, so they need education and encouragement before they can get better. Inspiration and change. This is why, there are a lot of records in the Buddhist scriptures, stories of ghosts and gods seeking advice from the Buddha.