Well good God, of course it is morally wrong for nations to pursue their “self-interest” in anything, and especially in border control policies. People have self interests that matter, morally; nations do not. Nations are toxic hellholes of false identity and purveyors of monstrous political violence. Nations are not rational people; they are not free associations or contractual agreements; they are unchosen, coercively assembled collectives, whose interests are typically an abortion of, if not an outright war against, the moral interests of individual people which actually deserve to be cultivated, practiced and respected. For anyone committed to individual liberty, a nations’ “interests” deserve no notice at all except to trample them underfoot.
National borders are a bloody stain on the face of the earth. Burn all nations to the ground.