I think "unintended consequences" is a better analysis framework than "parasite response from the ecosystem".

It certainly sounds less cynical, unless we use strong charity and see it in the most technical way possible.

I think the most plausible use case for government-funded incentives to have extra kids is a wide consensus that a society doesn't have enough of them at the time, according to some economical or social optimum.

But even this requires a level of cynicism in seeing kids as a means to an end.