[zazen]

You're trying to explain current Japanese demographics with a weird rant about WW2 without mentioning the subsequent economic miracle and population growth? The population of Japan was not far off doubling from 1945 to 2010, and in case you somehow haven't noticed, they became a major first-world economy, eclipsing many many nations which were not nuked.

80 years is really quite a long time. Germany also bounced back rapidly in the second half of the twentieth century to become a major industrial power.