Yoshiko McFarland says on her biography page:
Yoshiko was born in Osaka, Japan on Dec. 7th, 1941 as the 4th child and 2nd daughter of Masatake Mitsuhashi. Her father died as an army doctor before seeing her. Her first impressed memory was the view of burning Osaka at night with the sound of B29 fleets, sirens and bombs, and the ruins of the big town after the fire.
Her birthday was the day before Pearl Harbor Day in the Japanese calendar. But she had not had much chance to think about that deeply, because teachers for her generation avoided talking about the war. Later, when she had her eyes in the US, she realized her birthday was Pearl Harbor Day in the US, and how Americans feel about that day every year.
This shocked her, and it became the big reason to start to create the Earth Language. She agrees with the idea that Japan should never have big weapons nor fight a war for the sake of world peace. But she wondered what Japanese should do instead.
“We need to prepare rational tools instead of emotional weapons for keeping peace. We need to prepare a common background to feel that everybody on the earth is part of a single family” She couldn’t wait to put this idea into a concrete shape.
That concrete shape was Earth Language, a symbolic language with no spoken form. Her about page lists the usual reasons for creating a language for all mankind, and of course this will have no more success than any of the others (sorry, Esperantists), but it’s an interesting attempt and carried out with considerable detail. Anyway, better that people should spend their time constructing languages than blowing things up. You go, Yoshiko!