Caplan on the Immorality of "Citizenism"

Another excellent post by Bryan Caplan on the immorality that lurks behind nationalistic euphemisms such as "citizenism":

However, if a citizenist recognizes no moral obligations to non-citizens, I can only dismiss him as a monster.  The same goes if the citizenist says he recognizes some moral obligations to non-citizens, but then refuses to specify them or seriously consider whether the policies he advocates violate these obligations.