A libertarian, from whatever discipline he claims to be, defines himself as essentially individualist and non-conformist. The libertarian spirit, according to the views that I propose to lay out, manifests itself in a constant desire for clarity, realism, objectivity. However, the initial structure of human societies was, as we know, strictly communitarian. One cannot, consequently, study the behaviors that are appropriate to a libertarian spirit, without having previously situated the individual with the group. […]