Not an expert on this at all but I feel like it’s less of “the human race is going to die out” vs the owner class needs cheap labor and bodies for war to continue infinite growth.
My running theory is in the United States, Republican’s obsession with abortion is tied to the fact they need poor and broken families to pump out kids for future cheap labor and the prison industrial complex to make a nation function moving forward. That and the gray sunami of a upside down pyramid with not enough young to take care of the older generations (I think Japan and China are experiencing this currently).