Preemption and the Problem of the Predatory Expert

What kind of reasons for belief are provided by the testimony of experts? In a world where we are often inundated with fake news, misinformation, and conspiracy theories, this question is more pressing than ever. A prominent view in the philosophical literature maintains that the reasons provided by experts are preemptive in that they normatively screen off, or defeat, other relevant reasons. In this paper, I raise problems for this conception of expertise, including a wholly new one that I call the Problem of the Predatory Expert, which targets both original versions of preemption as well as new, modified ones that aim to avoid some of the standard objections.