Why are parents so predisposed with trying to convince other people to have children as well, especially those who have made a decision not to, either way?
How are those analogous? People can live perfectly fine without a child but can't without a job (unless they live at home with their parents which coincidentally a lot of hikikomori do).
The ability to attract and successfully integrate hundreds of thousands of immigrants per year to support an oversized elderly population is not a luxury that most countries that can afford.
For most communities, normalizing childless will only come back to bite people in some form or another.
All your posts seems to say is "we heard that kids are hard work in the short term so we decided not to have them".