The knowledge norm of assertion: keep it simple

Abstract

The simple knowledge norm of assertion (SKNA) holds that one may (epistemically permissibly) assert that p only if one knows that p. Turri (Aust J Philos 89(1):37–45, 2011) and Williamson (Knowledge and its limits, Oxford University Press, Oxford, 2000) both argue that more is required for epistemically permissible assertion. In particular, they both think that the asserter must assert on the basis of her knowledge. Turri calls this the express knowledge norm of assertion (EKNA). I defend SKNA and argue against EKNA. First, I argue that EKNA faces counterexamples. Second, I argue that EKNA assumes an implausible view of permissibility on which an assertion is epistemically permissible only if it is made for a right reason, i.e., a reason that contributes to making it the case that it is epistemically permissible to make that assertion. However, the analogous view in other normative domains is both controversial and implausible. This is because it doesn’t make it possible for one to act or react rightly for the wrong reason. I suggest that proponents of EKNA have conflated requirements for φ-ing rightly (or permissibly) with requirements for φ-ing well. Finally, I argue that proponents of SKNA can explain the intuitive defectiveness of asserting on the basis of an epistemically bad reason (e.g., a random guess), even when the asserters know the content of their assertion, by arguing that the asserters are epistemically blameworthy.