They are wrong, wrong, wrong on this, “Race-mixing is evolutionarily abnormal and nonadaptive” crap. I have no idea whether it’s non-adaptive or not, as opposition to race mixing has hardly been tried by humans. The whole history of man is one of the endless Race Cuisinart. WN’s argue that this history of man is bad, and that we all should have been breeding ourselves as completely pure lines all this time. But why? Looking at evolutionary biology, there is no benefit whatsoever to any species that propagates a pure line and refuses to race-mix. Evolutionary biology and in particular conservation biology is adamant that it is necessary for species to race mix, at least within the species. Subspecies are valuable due to their contribution to the species. Evolutionarily significant geographical units are once again good for the species due to their particular genetic adaptations. The more genetic diversity, the more healthy the species. The less, the more islandization, etc. as the genetic diversity gets low. A species with low genetic diversity is considered to be on its way out. Now, WN’s argue that this hold true for every species but man, I guess because they are quoting the Bible now, or as eugenicists, they figure that evolution is over anyway. But if, as the eugenicists insist, evolution is really over, then why fret over race-mixing and differential breeding rates between rich and poor? All animal and plant breeders operate on the principle of endless race mixing. They breed strains forever and ever to come up with very excellent strains, the most perfect, the best strains, through this evil mechanism known as race-mixing. If race-mixing doesn’t work, why does every plant and animal breeder on Earth swear by it? It works great in all animals, except for humans? Why would that be anyway? Race mixing is the way of man. It’s basic tribal behavior, and it’s been quite adaptive for thousands of years. See here.
A tribe which celebrates its male conquests of alien women but closely and jealously protects its own women from alien men is going to spread its genes much more successfully than a neighboring tribe which is indifferent about who impregnates its women.
In fact the latter tribe will over the course of time carry more and more of the former tribe’s genes as its wombs are colonized and its resources and fitness are used to care for the former tribe’s offspring.
After a while there would be no tribes left that are indifferent and it becomes a race to see who has the stronger double standard. We are all descendants of this process.
We are out of the jungle now and living in the urban jungle instead. You think we are all that different? Forget it. We are mammals, like cats and dogs. Does your house cat act all that different from an alley cat? Not so much.