I've met other mixed people and none of them have been diseased or sterile. One guy was class tresurer, played football and ended up going to an Ivy League college. Both of us at a high school that was overwhelming white and extremely educationally competitive. Obviously I have a vested interest and I have never come across anything scientific evidence that would suggest this.
The ideas that whites don't inbreed is just not true. Historically European societies married cousins. And in particular the Spanish monarchy bred themselves to a kind with severe mental and physical handicaps. Nothing your saying is historically accurate.
And as for "genocide" firstly I don't count white people choosing to procreate less as genocide. Secondly how is it that white society is so advanced beyond other races and yet it can seem to be in control of its own destiny or the world media? Theory holds no water.