You're making a lot of assumptions about me, but that's okay, my writing isn't always as clear as it should be. I agree that there are many factors involved. But certainly if the value systems and leaders of those societies had group survival as their absolute top priority, they would be doing whatever is necessary to raise their birth rates -- and forbidding the entry of other races. I am not aware that any of the nations you mentioned are expressly doing that, nor exalting group survival as their value above all other values (as they should be doing). So I think the principle stands.