An "Evil" savior won’t hesitate to sacrifice a city to save a continent. They aren't paralyzed by the "trolley problem"; they pull the lever and move on.
They keep their enemies (and sometimes their harem) in line through sheer dominance. This prevents the backstabbing that often plagues "good" parties. harem fantasy good or evil will save the world better
Evil saves the individual. Good saves the alliance. A virtuous harem protagonist rarely fights alone. He accumulates goodwill from every kingdom he helps. His wives are often princesses or priestesses who bring armies and temples with them. To save the world, you need coalition building. Nobody signs a military alliance with a slaver. The "Good" harem builds the United Nations; the "Evil" harem builds a death cult. An "Evil" savior won’t hesitate to sacrifice a