How would they know if you make a settlement on the other side of the planet?
I'm talking about the Ba'ku actively letting people (not that they could actually stop people from coming) settle on the planet. People requesting from the Ba'ku to be able to live there with their knowledge, but wanting to let the Ba'ku still do their thing and just settling on another side of the planet or something. They should have listened to Spock. Apparently, the needs of the many did not outweigh the needs of the few...or the one.