Checking those quads.
Have you ever heard of something called "balance?"
As in, too close is bad and too far away is also bad?
This is another case of .
White men worth a damn don't need this explained to us since it is SO DAMN OBVIOUS.
Too closely related is BAD. Too distant (racemixing) is ALSO BAD. Balance.
Also, "hybrid vigor" only occurs between two SEPARATE purebred strains, and only under SOME circumstances. Furthermore, even in those cases that "hybrid vigor" occurs it only lasts for a SINGLE generation. The children of "hybrid vigor" crosses will tend heavily towards the mean between the two "grandparent" strains and will often be weaker and less vigorous than either purebred grandparent. Also, there is very little evidence of any "hybrid vigor" among humans.
Perhaps the cruelest and most hateful thing that a White person could EVER do to their children is make them mixed-race.