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Is it possible for a theory of justice to be metaphysically neutral ? John Rawls, in his paper published in 1985 and titled “Justice as Fairness: Political, not Metaphysical”, as well as in his book Political Liberalism published in 1995, defended the thesis that a theory of justice which is supposed to be applied to a liberal and democratic society should not be rooted in a comprehensive doctrine, but, on the contrary, must be confined to a formulation of rules of political conduct and repartition of goods which is metaphysically neutral. From an alternative standpoint, this paper is an attempt to show that such neutrality is not verified in Rawls’ argumentation, especially when human rights’ justification is concerned, and that this failure in implementing neutrality is what helps to preserve all the critical strength of Rawls’ theory as compared to other doctrines as utilitarianism.