>What if, for whatever reason, ethnic group A subsidizes B's existence? This difference will damage the social cohesion necessary for a welfare state to exist.

>What if, for whatever reason, ethnic group A subsidizes B's existence? This difference will damage the social cohesion necessary for a welfare state to exist. In the real world, we observe huge group differences in productivity, educational attainment, conscientiousness, fecundity, and other characteristics, and in the real world, we see that mixing groups does indeed damage social cohesion. I understand that this observation is unpopular --- but this unpopularity doesn't make it wrong. If wishes were fishes, I'd order a plate of chips. You're proposing we ask a "what if" question without tying it to reality.