Then doesn't it make more sense for the people who prefer living among a high fertility rate to move to the places where there's a high fertility rate? Why should people who don't have that preference have to endure mass migration when they don't want, didn't ask, and didn't vote for it?
The folks in charge have made it pretty clear they want Caucasian people, especially northern European or white South African. They believe what made the US great in the past wasn't a diverse population sharing power. Rather people like them at the top, owning and ordering around everyone else.