The Liberal Duty of Factual Justification

Abstract This paper explores whether public reason liberals have an obligation to justify the factual claims that underpin coercive norms. Traditionally, liberal theorists have focused on justifying moral principles, assuming that empirical facts are either (1) not as deeply relevant to people’s lives as moral beliefs or (2) can be easily resolved through expert consensus. However, increasing public disputes over scientific facts and recent findings in cognitive psychology challenge these assumptions. I contest this view by presenting three counterarguments. The Inseparability Argument states that factual and moral claims are deeply intertwined, and many empirical beliefs are rooted in broader worldviews that shape personal identities; the Equivalence of Public Reasons Argument maintains that, insofar as factual claims play a decisive role in shaping coercive policies, they must be subjected to the same justificatory standards as moral claims; finally, the Argument from Epistemic Pluralism claims that liberal societies are not only morally but also epistemically diverse, with citizens holding competing views on what counts as reliable knowledge. Together, these arguments support the existence of a Liberal Duty of Factual Justification (LDFJ), asserting that public reason liberals must engage in the justification of factual premises, as they do with moral principles, to maintain democratic legitimacy.