It's funny how that happens sometimes. Reminds me of the United Nations' "Declaration on the Rights of Indigenous Peoples". The only four countries that didn't sign it initially were the ones that actually looked at it and thought about whether they could really achieve it.
That’s a charitable description of the states that voted against and an uncharitable description of the ones that voted for. A less loaded description would just observe that the opposed countries were the ones where the indigenous peoples would have the greatest claims and the governments would have the greatest resources to claim.