They still value GDP growth, which they believe requires population growth, so they promote growth overseas and immigration, so most countries with below replacement rates are still growing in population.

People seem to understand that if you move a factory from one country to another you haven't decreased its pollution, especially if the new country has laxer environmental regulations. If you offshore population growth, you haven't decreased population growth either.

I'm not that optimistic either, but hope we learn from examples like Mechai Viravaidya in Thailand https://www.youtube.com/watch?v=sgMNhMRgkHE that nations can manage populations voluntarily, increasing stability, peace, and abundance per person -- no eugenics, One Child policy, or racism. More like the opposite.