You ought to read my Bible. It says to be fruitful and multiply.
Obviously any group can reproduce more if it is more fruitful.
If I read this statement correctly, I think I disagree with your reasoning. Let's run wild with stereotypes for a moment: Affluent white America makes the conscious choice to limit family size. Poor non-whites make the conscious choice to have more children than they can afford. The Leftists in government summarily take the resources of the affluent to subsudize the poor. Therefore, the less fruitful group reproduces more, without any of the usual, natural consequences of such decision-making. Meanwhile, the affluent, who were already limiting family size based on economic considerations, will further limit their reproductivity based on the same criteria, since they now have even less resources thanks to those Leftists confiscating their wealth.