Parece que o tema ganhou uma nova relevância (e aceitação?) no pensamento liberal (difícil não lembrar a dificuldade de defender a tese, ainda não há muito tempo).
No Liberty Foundation.
The Fallacy of Open Immigration, by Stephen Cox
To Filter the People, by Bruce Ramsey
Via Stephen Kinsella, que também nota:
"I will also say that the latest issue of The New Individualist also has an eloquent Objectivist defense of fairly open borders. But Cox's piece is very well done and though provoking. It would be interesting to see the response by honest libertarian open-borders advocates to his many fine points. For more on this topic: Hoppe's writings on immigration; and my A Simple Libertarian Argument Against Unrestricted Immigration and Open Borders (and followup)."