As for Sagani she does it because she's been ground down by nihilism and a belief that the cultural practice which kept her away from her family and everything she cared about for years on end didn't matter. What has this got to do with anything?
According to several real world religions, suicide is an unforgivable sin. Which would maker her, but those value systems, evil.
Okay let's slow down. What is your argument here? What is your stance? Because if you're going to be talking about that, then a more salient point is that she and every companion in every rpg is evil because they do a whooooolllle lot of murders. So on what ground is this discussion taking place?