In fact, it is a capitulation compromise after realizing that it is impossible to defeat the Earth Alliance.
Just like in Earth's ancient times, when European colonizers reached the Americas and Australia, they did not opt for negotiation and mutual benefit with the indigenous people but instead implemented large-scale massacres and displacement policies.
The vast disparity in strength made slaughter the lowest cost method of conquest, allowing them to monopolize the world's resources.
In contrast, cooperation posed numerous uncertainties, and there was no guarantee that the local forces supported through cooperation would not backstab them in the future, presenting potential risk factors.
Therefore, even if they did not choose slaughter, they would use enslavement to make the native people serve them.
Expanding this to inter-tribal relations, it is even more so.
