I guess the real question is: Once we assume that such a category of people as “illegal aliens” is a legal and moral possibility, where do we draw the line in doing something about it? An alternative which would not require us to draw any such line would be to abandon the whole concept of an illegal alien and regard every human being on the planet as a member of the human race and a citizen of the world. Inside the United States no matter what state we were born in, we automatically acquire state citizenship merely by moving there. Thus I was a citizen of Michigan for 36 years despite having been born in Oregon, and my wife is a citizen of Oregon despite her birth in Connecticut. There is no reason why this system could not work at the world level, and I am sure that at some future time we will have such a system.
(via azspot)