The essay reconstructs for essential ways origins and grounds of the right to migrate, analyzing above all Francisco de Vitoria’s reflexions on Spanish american colonization. This analysis underlines the right to migrate is not only an ancient right but also a right conceived and claimed in European and overall Western tradition, either by religious thought or by secular one (e.g., Kant). Today, as Ferrajoli observes, one of the target of migration flows is our societies of affluence. By consequence, these societies disawow the right to migrate and the mainstream public discourse rediscovers boundaries and supports many other forms of cultural, economical and legal barriers against the so called «invasion». The inhospitality goes as far to sign international conventions to put these barriers out of European Union: in this way it’s posible to attribute hipocritically to these no european countries the moral and political responsibility of the human rights massive violations to the detriment of migrants. These migration policies are nevertheless blind, othe than inhuman, becouse they don’t face the deep reasons of migration, in this historical moment as well as in the future. They are short range policies, as F. Pallante points out, not only far from a cooperative and solidary vision of global relations, but also inadequate to realize efficacious migration flows programmes inspired by a precautionary principle targeting to the medium-long term. In other words, making migration policies really useful to protect the «natives» by the «invasion risk». Similar irrational instincts, as Lukács and Horkheimer pointed out, lead to twentieth century totalitarianisms. Starting from these considerations, in the last paragraph the author makes some remarks about unmasking effects produced by the Covid-19 pandemic. First of all, the pandemic that hardly stroke our affluent societies unmasks the deep irrationality of neoliberal globalization.