Closed borders is a form of discrimination. But if we open them and want to maintain our standard of living we'll have to make them second class citizens. As t

Closed borders is a form of discrimination. But if we open them and want to maintain our standard of living we'll have to make them second class citizens. As the article argues, this is better than excluding them from our labour market. But discrimination like designating people as 2nd class citizens is probably more repundant to people's sense of ethics than closed borders. And perhaps these moral tabu's are not without importance. I'm not sure, but "closed borders" do seem worse than a 2nd class of citizens.