Earlier quoted context omitted.
Being from Europe myself, I suppose I'm biased to wanting to preserve Europeans, and am not satisfied with merely preserving humanity as a whole.
Then why the concern with America and Russia too?
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_d... for that.