If you're going to make a financial argument (as opposed to the moral one), you should take a look at how we fund entitlements in this country. You want population growth. The financial disincentive for having kids is a real problem.
We don't want an aging population that has to be supported by a shrinking working-age population, but we don't want to be trapped in a growth bubble either. We want sustainable population with ever increasing quality of life due to scientific and technological advancement.
Population growth might be truly desired if we get to colonizing other planets…
You want a steady population level, whether via births, or immigration, or both.