"Whites" are able to reproduce because most of them live in apartheid communities where they are safe from agitation, whiteness will have no desire to reproduce itself if its in a constant state of agitation. That's the why "whites" cannot be allowed to live in their own gated communities, they need to be flooded by non-"whites" who are immune to the whiteness, and ideally flooded by the type of non-"whites" that produce the most agitation in "whites". Once this happens they cannot be allowed to escape, their can be no "white" flight for them. In this way the immunized non-"whites" can be able to start purifying the air.