Lol what? White supremacy would be wanting and aiming to have the white birth rate above every other race because you think they are better and you want the planet to be majority white. Simply not wanting your race to vanish off the face of the earth isn't white supremacy...
The only people that wouldn't care about their race vanishing are self hating white people.
And yet greater genetic diversity comes from greater diversity, lest we become pugs.
We are destined to be olive skinned, just deal with it.