well i personally think that "Beeing evil" shouldnt be the "Hard" option.
It should be the easy option.
Generaly beeing evil makes your life easier.
Ad in terms of mass murdering, this makes no sense for DnD, but for OS2 it makes a lot of sense.
A lot of the "Moral choice" in OS2 is about wether or not you devour the souls of people.
theres no actual consequence for doing it, which is also part of the games lore.
The gods do it, Lucian does it, essentialy there is no big "judgement", in the game, any good in the game can only come from you yourself.
Its a game about defying the current order whcih is built on the exploitation of mortal worshippers.
in a sense, not having consequences for beeing a huge asshole is part of what makes the sotry of OS2 what it is. Most people that do evil shit get no consequences unless you personally dish it out.
And doing so pretty much requires you to wipe out all factions the game has, as every sinlge one of em is either 1. wrong 2. malciious or 3. misguided, tho the "misguided" part probably only appleis to the seekers, who are the closest you get to "good guys", when realy they are just pawns.