  McGrath’s principle is congenial with the position known as “conciliationism” in the peer disagreement debate, although that position is more often stated in terms of justified or rational belief than knowledge (see Frances 2019 for an overview of the positions and arguments the debate revolves around). An interlocutor is your peer, roughly, if he or she is just as well equipped as you are (for example, in terms of evidence and reasoning skills) when it comes to figuring out the truth about topics of the kind the contested belief concerns. According to conciliationism, if one learns that one’s beliefs are opposed by a peer, then one should drop the beliefs or at least reduce one’s confidence in them. Conciliationism thus offers a way to argue that moral disagreement sometimes has the type of significance assigned to it by moral skeptics (see Rowland 2020 for an extensive discussion of the strategy).