In stickverse, every race started out with the land given to them by the gods.
Either people have the right to live where they want, even in land that was was once owned by other people, or they only have the right to live in land given to them by the gods.
If the former, then goblins have the right to live there, even if other goblins did steal it (I’m not saying goblins have the right to steal. I’m saying that people have the right to live where they want, regardless of if it was stolen ).
If the later, then goblins are oppressed by the gods to live only undesirable lands.