The question of social diversity vs cohesion has received a good deal of bona fide debate in economic and sociology, so there is no need to bait it with references to racist vigilantism.
All I am saying is that any country with this level of inequality would have a hard time to survive as a whole if it were not for its isolation and government bribes to buy social peace.
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Apologies for the los vigilantes-baiting.
I find that now you've explicitly stated your meaning, highlighting the inequality factor, I mostly agree with the core argument. Yes, in the absence of greater equality there's a much higher probability of mayhem when society stressing events happen.
Your use, originally, of phrases like "poisonous diversity", which focus one's attention -- and not in a pleasant way -- obscured all that behind an angry-old man-on-porch-with-shotgun curmudgeon-osity.
.d.