If we call ourselves human beings, we must act accordingly.  Being human means giving, and wanting to give.  Having too much when one's neighbor is starving is inhuman, immoral, and, ideally, illegal.

This type of argument, applied to the question of immigration, implies that citizenship confers legal privileges, but no moral ones.  As Canadians, we have a right to keep others out of this country.  As human beings, though, we have no such right.