It's not necessarily an emotional response. It's basic intelligence. There are people who should not have children simply because they can, for various reasons. Can that change? Sometimes. Sometimes not. It takes quite a large amount of arrogance to claim that you know what is the core of everyone's existence and what they should or shouldn't do, especially when it concerns something as serious as having children. I think you're confusing the response to your arrogance with brainwashing or an aversion to people reproducing. We get it. You love having children. Wonderful! That doesn't mean everyone should have them. I see multiple examples of such people every shift I work in the emergency department. I'm sure there are many other examples.