Ignorance 

If I were a Japanese female I would be extremely offended by the above paragraph.

The claim to know what "Everyone" thinks is very conceited.  Since most women fall into one of the categories
listed above, the writer has insulted the entire nation of Japan by stating that the current population is, or
is decended from, prostitutes.

As for Japanese culture, it is alive and well.  Imagine what it would have been like under Communism.

If the writer believes that Japan was better off in 1940 than it is today, tell that to all the Japanese woman
that now have the right to vote.  Tell that to Japanese women that have become engineers and politicians, making
Japan one of the most powerful nations in the world  all without the use of arms.