I understand you don't buy the idea of growth continuing through 2100, but I don't buy the idea of it ending beforehand until I see a citation. I found at least one estimate that supports my position; I haven't seen significant evidence to support the idea of growth ending that soon. All the things you list keep people employed.
I wouldn't just point to the "right wing" as authoritarian; that seems like needlessly politicizing a social problem. Dictators have no values or political alignment but their own moral gain.
With respect to your earlier comments around advertising, I don't know about Europe, but America has never advertised having a large family or a small one. Not sure it's the role of government to try and shape social norms; that's generally referred to as brainwashing.
[0] https://www.brookings.edu/blog/the-avenue/2018/12/21/us-popu...