How to easily defeat any argument for God

[Belacqua]

So based on the original question, let take the example of gave of Japan.

It would be beneficial to the wellbeing of Japanese society, if their younger generation got married and produced more children. The situation currently shows a growing trend that’s causing a significance demise of their society as a whole.

Yet, I don’t see the idea of forgoing marriage and children as immoral, do you? Is it immoral for Japanese young people to be okay with the predicated decline of their society as a whole, as a result of low birth rates? I don’t think so.

As a longtime resident of Japan, I can tell you that what you say here is true. And it is much in the minds of Japanese people, including their politicians. 

With the population aging, and the numbers declining, traditional Japanese values about society and family are unsustainable. Maybe "decline" is a judgment call -- certainly it will be difficult to maintain many positive societal practices from the recent past. Like multi-generational families supporting one another, excellent health care at cheap prices, high quality public infrastructure and services, things like that. 

(I don't think Mr. Ire is the least bit interested in a reasonable discussion.)