Originally Posted by Sadurian
There are many examples of downright evil people who displayed what would be classed as good behaviour.

But that one "good" behavior does not stop them from being evil. Even with that "good" behavior, they are still evil. That's my point. So if you are talking about the game allowing that evil character to do that one "good" thing, sure. I can accept that. But it should not change the fact that they are evil. And that is what alignment gives us.
Originally Posted by Kadajko
You can't accommodate for all the logic any individual could follow, why would you reduce roleplay value based on your arbitrary interpritation of someones motives?

1) Save the tieflings. [ Good ] ( They've done nothing wrong and don't deserve to die. )
2) Save the tieflings [ Evil ] ( I think tieflings are evil Devil spawns and I want to watch the world burn. )
3) Kill the tieflings [ Good ] ( I think tieflings are evil Devil spawns and I will rid the world of them. )
4) Kill the tieflings [ Evil ] ( I just like killing. )

I can come up with ANY alignment motivations for ANY action, every dialogue choice would have to have like 9+ variants of the SAME option in different flavors, OR we can just roleplay in our head what makes sense.

Which just reduces ALL actions to meaningless sameness. In this kind of a framework, there is zero point or value to role-playing. All of this, including the discussion of Shar's nature, may be subjective to you. But they are not subjective at all in the world of the Forgotten Realms setting.