Sometimes being good means doing evil.
How many people have "good" D&D characters murdered? Often that number seems pretty high. lol.
I mean characters like The Punisher would be a chaotic good, right?
So you think that everyone that is raised in an ''evil'' society are tragic and broken? All drow, all goblins etc? Every individual can feel sad for loss. Also, from what I undrstood, she killed a lot of the people she cared about due to betrayal, not enemies, but it's not that important. There are always unpleasant things on any path you take, doesn't mean that the path is not for you, as soon as you encounter the first difficulty.
Two questions to ask:
- Why is the society evil? Is it because some members of that society are being abused? If everyone's happy then it gets a bit hard to argue that it's an evil society.
- Why is the character evil? Can they adjust to living in a "good" society where you'll be more successful by being nice and friendly?
There are plenty of examples of evil/good characters who adapt to the society they involve themselves in. Urdnot Wrex from Mass Effect is an example. He comes from a brutal "evil" society, but he joins your party and he's a pretty cool guy. However, one of his goals is to revive the krogan race from the brink of extinction, so when it appears that the villain Saren will be able to help him achieve his goal, he is willing to betray you and join Saren against you. To keep him from betraying you, you have to convince him that:
1) This is not the right way
2) Saren's just going to enslave them anyway.