Actually, there is: economics. You can't have a successful country and exclude everyone who wasn't smart enough to be born there. In a world of N billion people, a lot of talented people are going to be born abroad. Keep them out, and they'll concentrate in other places.
Do you realize how much of the tech world was built be people from all over? HTTP, Linux, Google, Java, C++ and so on.
Do you realize how much of the tech world was built be people from all over? HTTP, Linux, Google, Java, C++ and so on.