I look at it from a Darwinian POV. Lack of diversity is not good for any evolving system - too much inbreeding (positive feedback for negative traits) happens. More diverse species have a better chance of long-term survival.
It is not necessarily true that more diverse societies have a better chance of long-term survival. Only monarchies, oligarchies, et al, have lasted for more than a few hundreds of years. Even those have eventually crumbled. But maybe a diverse, egalitarian society could do well.
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