Femanon here.
There's two ways to view race mixing: you're either wasting genes or spreading genes. For the most part, it's wasting if you're a woman and spreading if you're a man, as long as you also impregnate women of your race (even if it's by being a sperm donor).
If a white woman has a baby with a black father, she's wasting a lot of her potential as a woman given that a woman has a 9 month gestation period followed by a minimum of 18 years of raising that child. She will also only be fertile for so many years and her body will only give birth to so many healthy babies. By the time a woman is 30, she's technically 15 years past her child bearing prime. So this stuff matters. You have to really fucking pick who you have kids with if you're a woman.
On the flip side, if a white man chooses to knock up some nignog, he only really invests whatever time it takes to plant his seed and move on. In a perfect world, dads would stick around to help raise the kids but who are we kidding? Most black kids don't even know who their dad is, so why would a white man trashy enough to fuck a sheboon go against this trend?
Of course, the time investment disparity is true even in intraracial pregnancies. But I still think a white woman is wasting a potentially valuable asset (her fertile eggs, of which she has a very finite supply) on low quality sperm when she fucks a nigger and lets him inseminate her. Conversely, a man has a near limitless supply of sperm cells and so he can fuck as many nigger bitches as he wants and still have plenty of sperm left for humans.