I think it is simply there are not a lot of Japanese who understand and speak/write other language than Japanese.
If you had any business experience with Japanese before, you should understand that it is not a country very open
to the world.
This is also same for French. Usually French also does not like to speak other language than their own.

This happens commonly in country which has very old tradition and history and when their people are very proud of it.
So, the best way is to learn Japanese.