 Lackey acknowledges that (GJ) “is not only intuitively plausible, it also is easily supported by applying an aggregative framework to group justifiedness” (2016: 361). Nonetheless, she proceeds to argue that (GJ) should be rejected. One major theme in her critique is that (GJ) falls prey to a paradox (on contradiction), which she calls the “Group Justification Paradox.” It questionably allows a group to end up justifiedly believing both a certain relevant proposition and its negation. Lackey hastens to acknowledge that not all contradictions, or inconsistencies, are necessarily fatal. For example, the well-known preface paradox is a case that generates inconsistent propositions, but it is nevertheless reasonable to have. An author’s apology in the preface is epistemically reasonable, given our grounds for holding that we all have our own fallibility (2016: 364). However, Lackey continues, the Group Justification Paradox admits no such approval. So the incidence of such contradictions does constitute a challenge to the proposed theory of group justification, even if the preface paradox does not present a problem.