Misinformation, disinformation, fake news, alternative facts: we are awash in a vast sea of epistemically questionable, not to mention false, testimony. How can we discern what is epistemically good to believe from what is not? Why are so many of us vulnerable to believing in ways that are unresponsive to widely available evidence – in other words, to holding bad beliefs? 
In Bad Beliefs: Why They Happen to Good People (Oxford UP, 2021), Neil Levy argues that we are in fact acting rationally, in accordance with how we have evolved to defer to our peers and authorities in our social networks. Levy, who is Professor of philosophy at Macquarie University and research fellow at the Oxford Uehiro Centre for Practical Ethics, argues that bad beliefs are more likely in epistemically polluted environments, and that our current epistemic environments are badly polluted. Overall, the book takes a bold stand against the traditional epistemological emphasis on the individual cognitive agent’s responsibility for justifying belief.
This book is available open access here. 
Carrie Figdor is professor of philosophy at the University of Iowa.
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