Since we're already treating people like cattle ("we need bodies") to be moved around at will here, then we might as well make a comparison with a cattle farmer. If his cattle are not reproducing and thus are dying out, what sensible person would suggest that the solution is to get cattle from other farmers? When is it time to ask why his cattle is dying? Is it because they deserve it? Is it because the farmer needs the milk more than the calves?

I personally want my people to survive and not join the scrolls of history on the long list of exterminated tribes. If we have to survive outside of our current geographical country in a different place, then that is preferable to extermination.