We ask whether it is reasonable to delay or refuse to take COVID-19 vaccines that have been shown in clinical trials to be safe and effective against infectious diseases. We consider two kinds of vaccine hesitancy. The first is geared to scientifically informed open questions about vaccines. We argue that in cases where the data is not representative of relevant groups, such as pregnant women and ethnic minorities, hesitancy can be reasonable on epistemic grounds. However, we argue that hesitancy is (...) not reasonable if a vaccine has passed well-conducted clinical trials. The second kind of hesitancy is to do with beliefs about the institutions offering a successfully trialled vaccine and the justifiability of cooperating with those institutions. For example, in the UK, distrust of the UK Government or the National Health Service is identified as a factor in the vaccine hesitancy of minority ethnic populations. We ask whether this sort of hesitation is reasonable given normative requirements of fair co-operation, both with those institutions and the wider population. We suggest that the answer is not straightforward. Sometimes the hesitation is unreasonable but understandable. (shrink)

Heterodox ideas face an uphill battle. This is not least the case for heterodox conspiracy theories. As an empirical observation, this is hardly controversial. What is controversial is whether and to what extent this should be the case. Some authors have gone so far as to argue that heterodox conspiracy theories should be generally dismissed, and that it is precisely their heterodox status that justifies such dismissal. Most particularists are likely to object strongly to such an assessment, arguing that conspiracy (...) theories – whether heterodox or orthodox – should not be dismissed before careful examination of the relevant evidence. But even particularists will probably concede that proponents of heterodox conspiracy theories have to bear a special epistemic burden. The main aim of this paper is to take a closer look at this particular epistemic burden. Drawing on the literature about peer disagreement, genealogical debunking arguments, and related philosophical debates, I focus in particular on the question of whether and under what conditions it can be rational to defend heterodox conspiracy theories, and argue that what I will call theories of error play a crucial role in this context. (shrink)