Insofar as one's beliefs about sacrificing for the greater good being an incentive, yes, it's all about aligning incentives. But having a child isn't seen as a

Insofar as one's beliefs about sacrificing for the greater good being an incentive, yes, it's all about aligning incentives. But having a child isn't seen as a responsibility one has to one's own parents, who sacrificed to have them, or a responsibility to one's people, culture, or religion anymore. That's the ultimate root of all these problems. People now get to choose whether or not to have a kid, and not everything people choose is good for society.