To be fair, it’s a bit silly to assume all goblins are the same.
I don’t think “nature” would be racist like that. Even if other goblins have polluted and cut down trees and what have you, but your player character goblin never approved of that, left his people and sought out nature as a good soul with a wise and loving heart… maybe they even want to undo some of the damage they have seen their people do… why would nature reject them?
It’s similar to how a lightforged draenei could tire of the teachings, loose faith and go rogue, seeking the power of demons to fight demons. Maybe after watching a loved one die she decided you have to fight fire with fire.
This is the RP in RPG. Sky’s the limit. 