[Editor's Note:  This is a guest post from Professor Anthony F. Lang, chair in International Political Theory and  Director of the Centre for Global Constitutionalism at the University of St. Andrews.] Since I wrote my short defence of punitive air strikes against Syria last week in a post at Carnegie Council for Ethics in International Affairs , a number of commentators have given their own, more critical, accounts of this use of military force (see, for instance lots on Duck itself, such as Charli Carpenter; Stephanie Carvin on Opinio Juris ; , and Dan Kenealy and Sean Molloy in The...