> overpopulation has been a concern for many decades, yet politicians that ignore the problem, or actually advocate for more population, somehow keep getting elected
Most societies have reached a point where fertility rates have declined to below replacement.
This is a dubious use of "society", and it ignores the fact that the world population is growing at an extremely fast rate still.
> Most societies have reached a point where fertility rates have declined to below replacement.
And governments in those countries are importing as many people as they can to paper over their own population decline.
Most developed societies. When you live by subsistence agriculture, having lots of kids is a benefit as they are free labor. When a culture urbanizes and industrializes, they are less of a benefit.