A norm governing an act should track the constitutive aim of that act; since assertion aims at truth via knowledge, justification without knowledge fails to meet this constitutive standard.

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Constitutive aim(Applied to belief (aiming at truth) and action (aiming at the good or at self-knowledge)): An aim that is essential to or definitive of a given mental state or activity, such that the state or activity is partly individuated by having that aim
Truth(Horkheimer's critical theory epistemology): The relation of propositions to reality, where both human conceptual activity and an independent reality are given equal weight.
assertion(Philosophy of language; speech act theory): An illocutionary act characterized by assertoric force together with the applicability of cognitive and social safeguards that distinguish it from other illocutionary acts and other forms of information transfer
justification(Third condition of the tripartite account of knowledge): The condition on a knower's belief that excludes mere luck — the belief must be held in a way that is appropriate or warranted, not merely accidentally correct.

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