[note: this blogpost collects some scattered thoughts I hope to organize in article form sooner rather than later, for my British Academy project on religious social epistemology, see here]
There is an ongoing debate what we should do when we are confronted with disagreement with an epistemic peer; someone who is as knowledgeable and intellectually virtuous in the domain in question. Should we revise our beliefs (conciliationism), or not engage in any doxastic revision (steadfastness)? Epistemologists aim to settle this question in a principled way, hoping general principles like conciliationism and steadfastness can offer a solution not only for the toy examples that are being invoked, but also for real-world cases that we care passionately about, such as scientific, religious, political and philosophical disagreements. However, such cases have proven to be a hard nut to crack. A referee once commented on a paper I submitted on epistemic peer disagreement in science that the notion of epistemic peer in scientific practice was useless. S/he said "It works for simple cases like two spectators who disagree on which horse finished first, but when it comes to two scientists who disagree whether a fossil is a Homo floresiensis or Homo sapiens, the notion is just utterly useless."
That referee comment has always stuck in my mind as bad news for epistemology: if we can't use our principled answers in epistemology to apply to real-world cases of epistemic peerage, the debate is of marginal value. There seems to be an easy escape: one common response, both by steadfasters and conciliationists has been that we need not revise our beliefs in complex messy cases if we have reason to believe that we have access to some sort of insight that our epistemic peer lacks. van Inwagen, for instance, muses about his disagreements about some philosophical matters with David Lewis, whom he greatly respects: they both know the arguments, and both have considered them equally carefully. But ultimately, van Inwagen thinks
I suppose my best guess is that I enjoy some sort of philosophical insight (I mean in relation to these three particular theses) that, for all his merits, is somehow denied to Lewis. And this would have to be an insight that is incommunicable- -at least I don't know how to communicate it--, for I have done all I can to communicate it to Lewis, and he has understood perfectly everything I have said, and he has not come to share my conclusions.
As one can see, the notion of epistemic peer simply dissolves here, since van Inwagen just asserted that he has insights in the domain in question that are denied to Lewis. To take another example, suppose you are a Christian faced with a seemingly equally intelligent atheist. According to Plantinga (WCB), this disagreement is not a defeater to your beliefs, as you can confidently assume your dissenting peer "has made a mistake, or has a blind spot, or hasn’t been wholly attentive, or hasn’t received some grace she has, or is blinded by ambition or pride or mother love or something else". But how do we know when we are right? Is the "feeling of knowledge", the conviction we are right, any indication that we actually are right? I will argue here that it is not, and therefore, that simply discounting the other as epistemic peer on account of this is not warranted.
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