And the point about Race Purity was pointing out absurdity of how/when its applied, yes.

OK gotcha

Point being that a very minuscule amount of people is still enough to have notable effects, especially, as is always the case, when they refuse to assimilate and instead retain their own culture. And that the post's insistence on it only being "mass" paints a very different picture than reality in which a tiny number is still enough to effect.

If we go with the full 60 people, it was less than 0.05% of my town's population. A rounding error of a number that wouldn't even phase most people still could have a noticeable effect on local populations.

I agree, but my point is that a shipment of migrants around *.5% of the population is actually mass immigration. Against the US population that would be 1.7 million migrants, and people are rightly sounding the alarm for numbers around that size or less.

For comparison, the immigration quotas before Hart-Cellar were 1-2% of the population of the migrant's race, with no chain migration. And indeed, that kept the demographics of the US stable at 90% white until the law was changed.