Why not? Aren't they worth preserving? A better question would be why no concern for China and Japan. In case of China, it's because they consider themselves o

Why not? Aren't they worth preserving? A better question would be why no concern for China and Japan. In case of China, it's because they consider themselves overpopulated. In case of Japan, I simply neglected to include them on the list - it was not meant to be comprehensive, see https://en.wikipedia.org/wiki/List_of_sovereign_states_and_dependencies_by_total_fertility_rate https://en.wikipedia.org/wiki/List_of_sovereign_states_and_d... for that.