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Being DINKWAD is a life choice and is no one to judge someone who does not want a child and would rather spend their time raising pets or do something less restrictive in their life. Nevertheless, when large numbers of people in a country follow this lifestyle, then there is likely to be impact on the population growth and may slow down economic growth over the long term. Countries such as Japan and South Korea already experience aging populations and decreasing birth rates, which can cause problems to both labor supply and the social system. Immigration and foreign workers can contribute at the same time, but it is not the ideal solution. It is the compromise between the choice of individuals, as well as national demographics.
Yes, we have nothing to say to the dinkwads who have decided it because that's their lives to live of and that's what they're available to raise and they understand how tough life is when raising kids. And for the countries who have a lot of aging people, they're accepting more immigrants for their economy to keep up. But we can't also guarantee that they'll be treated fairly because that's where the inequality comes based on the society that they're living. Even if we praise these countries to be a good and first world countries, the racism that's done to immigrants can't be gone.
Developed countries will campaign for having children, and the state will provide free education, healthcare, and benefits for every family. On the other hand, developing countries will tend to campaign for better planning when deciding to have children, with one or two children being enough. Based on this reality, I think anyone can easily understand that the decision to have children is also heavily influenced by economic background and state encouragement.
Some families who are unprepared in many ways, including mentally, will tend to choose not to have children, and to avoid loneliness, they sometimes choose to raise pets instead. I think the choice to have children or not is situational, and for now, I see many people will tend to choose to have children.