Inferentialism may be adapted to provide an account of delusions that may be extended to communities. The notion of community oriented proprieties, which are so central to inferentialism, substantiate a clear picture of commitments (and so beliefs) in communities. They may be used to describe and assess both commitments that we might consider sound and commitments that we might consider delusional. That's precisely what this presentation aims to address. Following Brandom, the inferentialist position and these central mechanisms are reconstructed in deontic terms. They are then applied to a set of cases, illustrating how they might be used to account for standard commitments, for delusional commitments, and lies -- differentiating them from one another along theoretical lines. These basic cases are then extended to a more complex social context with actors in addition to the assessor and assessee. In closing, a number of potential extensions to the proposed framework are briefly considered and supplemented with a few remarks relating this approach to the broader context of delusions.
Presented at the Fifth PLM Workshop on Delusion in Language and Mind, in Amsterdam, October 23---24, 2020