No offense, but this all sounds extremely unlikely. Human beings simply don’t operate that way, even under extreme conditions. Assuming that source exists and is the way you recall it, I’m guessing it was some kind of propaganda.
Maybe someone from the UK can shed a light on this.
And the narration in the documentary almost matches my post completely. Except for the part last paragraph, of course.
This really shocked me and the more I pondered on it the more convinced I became that Japan is an inhumane society.
I know, it was a dreadful time after the war. But come on, killing children simply because they're not useful? That's not something any sane human being would do.
https://www.japantimes.co.jp/news/2018/08/25/national/media-...
https://www.koreatimes.co.kr/www/nation/2021/08/510_294387.h...