I am not. But two things. First, in response to the parent, I am pointing out something that Japan, Korea and China has in common. I am not asserting that "I am 100% sure that immigration is bad for the national average IQ". Second, of course individuals in an immigrant population are very successful and to great benefit to societies that receive them. And if you do not accept refugees, of course you miss out on some Einsteins. That's not what we are discussing here.