Can we consider the pre-commitment argument appropriate for the defense of a constitutional theory?

The discourse of legal constitutionalism has put forward the pre-commitment argument to defend the constitutional rigidity of institutions and procedures as well as non-availability of rights.
In defending that position appears the re-commitment arguments that are related to the anthropological position that carries a pessimistic understanding of the nature of human beings maintains a strong presumption about individual and collective irrationality, which could lead to a pernicious majority.
However, against the logic of pre-commitment – the discourse of legal constitutionalism –, has emerged, some reasonable criticism from a normative political theory point of view, which present itself as an integral proposal, whose essential basis is the existence of reasonable disagreements and an anthropological understanding of the nature of human beings, which is opposed to the pessimistic conception.