Maybe that factors into people's decisions, but the data suggest it's mainly a personal opinion rather than economic: https://www.pewresearch.org/social-trends/2024/07/25/the-experiences-of-u-s-adults-who-dont-have-children/.

Given that most people's opinions are shaped by their culture, we should do as much as we can to promote a culture of strong families. But it's also fair to say the government is a terrible allocator of resources.