What? That's exactly what happened here.
The Chagossians were forcibly removed, because a government(s) claimed "the right to occupy some specific geographic coordinates". If the Chagossians don't have that right, then no one else can come in and force them out.
The UK and USA only ever claimed a legal right within the framework of their own laws. Despicable as their actions may be, they never pretended to claim a human right.
The displaced Chagossians, on the other hand, are claiming a human right to occupy the islands. That's different.
Might may not make right, but it certainly helps. Other states may have some moral obligation to step in to defend a human rights violation, but only the government of a state is expected to protect its legal rights.