lol hitler comparison.
Wake up, son.
This is the state of the world: The GTVA could, at any time, be swept away by a Shivan attack. Their only hope for survival, not even of the political establishment but of the species, is strong forward defense and constant readiness. Ubuntu, merely by existing, would destroy both those things; the first by the movement of large segments of the population to Sol, the second by devaluing the military.
It is not even, in the end, about the fact that Earth's resources could save humanity, though they well could. It is about the fact that Earth's political leadership will doom humanity, and the Vasudans to boot. Not could, not even would, but will. It has nothing to do with "inferior races" or resources or population. It has everything to do with the fact that Ubuntu as a political philosophy amounts to the suicide of all known non-Shivan life.
This is not mere hyperbole. This is not justification. This is the best minds of the Terran and Vasudan races coming to this conclusion, before the plan to conquer Sol was ever considered.