We can say the same thing about certain cults as well. Some cults actively encourage having children, because the more children are born, the more members the cult gains. So sometimes having children is actually a brainwashed activity. Your hypothesis could certainly apply on a broader societal scale as well. There could also be a constant underlying propaganda coming from the internet, media, and modern countries contributing to declining birth rates. Or we might need to actually research why people make these choices. It could be a form of universal propaganda, or it could be driven by the high cost of living, or inflation caused by the fiat system. If you present such an argument, I would expect you to investigate the underlying reasons and share them with me. Then, I would truly enjoy reading and exploring that.

In one word: Incentives. There are many reasons historically, people used to have children and often, many children. 1. Labour - many hands make light work 2. Legacy 3. Old age care plan 4. High testosterone levels 5. Absence of other entertainment/distraction 6. Low infant mortality 1. no longer needed (AI, robots, other basic tech like dishwashers and washing machines) 2. Wonderfully and Sadly with the internet people can leave a permanent mark or stain of themselves on this planet into eternity without having children. 3. The breakdown of the family plus care facilities make this redundant. 4. Need I say more. Easy times + toxic food + sedentary lifestyles drop testosterone levels to a fraction of historical norms. 5. Convenient distractions combined with low testosterone, need I say more. 6. Spares are no longer needed. I’m sure many other points could be added here but I’m out of time. Final thoughts, don’t try to convince others to have children. There is a process of natural selection at play here. There is 1 thing every human on this planet has in common, our ancestors were survivors. This same comment will hold true, thousands of generations from now.