That said, I'm not sure if you're disagreeing with me or not.
No, I'm not. I think we only differ in small details.
My point is if it's decided that not helping the tieflings is enough to be considered evil... then why isn't every other person in the grove considered evil for not helping? It's a standard that makes no sense because it's only applied to the player characters.
The game/Dungeons & Dragons nudges you into that direction. You are the hero who has to come to the rescue of the damsel in distress. Which is why some people roleplaying the hero just take the behavior portrayed as 'good' in the game although they of course would never act like that in real life.
I don't mind such ethical discussions although being called 'evil' just because I don't help the Tieflings is a bit harsh.
Btw. did someone try what happens if you find out Khaga's secret affiliation with the Shadow Druids but do not expose her? Just because you don't feel you should intervene in druids' business?