Interracial breeding is always a good thing for whichever group is the superior gene pool in the equation. Assuming you're talking about whites/blacks, when they breed the child is biracial but generally considered black which removes those genes from the white gene pool.
Generally, the whites that would breed with blacks are less intelligent, less attractive and overall less desirable mates, which is the biological reason that they would breed their genes into an inferior gene pool. The cumulative effect of this is to remove those less desirable whites from the white gene pool, leaving a smaller, but better gene pool for whites to breed in.
You can see the same phenomenon all over the world where a superior gene pool interbreeds with an inferior one. Genetically, this is a very good thing for the superior gene pool, but they tend to struggle with it form a sociological perspective because on the surface it appears to be a rejection of ones own culture. They fail to see that these interbreeders are doing their race a favor.
We've practiced this for years, as long as you don't allow your culture to be lost in the process, your genetic position will improve at a much greater rate than it would have naturally.
Nice troll. I don't see Azkenazi jews in mixed marriages though?