Jake Ross

How are claims about what people ought to do related to claims about what ought to be the case? That is, how are claims about of personal obligation, of the form s ought to ?, related to claims about impersonal obligation, of the form it ought to be the case that p? Many philosophers have held that the former type of claim can be reduced to the latter. In particular, they have held a view known as the Meinong-Chisholm Thesis, which, on its simplest formulation, can be stated thus: MCT: s ought to ? if and only if it ought to be the case that s ?s.[i] This thesis, I will argue, is false, and the reason for its falsity is a general problem facing any related attempt to reduce personal to impersonal obligation.

Self-interest is widely regarded as an important, if not as the only, source of reasons for action, and hence it is widely held that one can rationally give special weight to one’s self-interest in deciding how to act. In what follows, I will argue against this view. I will do so by following the lead of Derek Parfit, and considering cases in which personal identity appears to break down. My argument will differ from Parfit’s, however, in that it will have a stronger conclusion, it will involve fewer assumptions, and it will be compatible with a wider range of theories of personal identity.

What theory should we accept from the practical point of view, or accept as a basis for guiding our actions, if we don’t know which theory is true, and if there are too many plausible alternative theories for us to take them all into consideration? This question is the theme of the first three parts of this dissertation. I argue that the problem of theory acceptance, so understood, is a problem of practical rationality, and hence that the appropriate grounds for theory acceptance are practical considerations. I argue for a number of principles of theory acceptance, and I explore the implications of these principles for the acceptance both of descriptive theories and evaluative theories.

One of the perennial challenges of ethical theory has been to provide an answer to a number of views that appear to undermine the importance of ethical questions. We may refer to such views collectively as “deflationary ethical theories.” These include theories, such as nihilism, according to which no action is better than any other, as well as relativistic theories according to which no ethical theory is better than any other. In this article I present a new response to such deflationary ethical views. Drawing a distinction between acceptance and rejection, on the one hand, and belief and disbelief, on the other, I argue that we have strong reason to reject these theories, even if we do not have reason to disbelieve them. In Section I, I clarify the question of what ethical theory we should accept, and I argue for the central importance of this question. In Section II, I discuss what I call “absolutely deflationary” ethical theories. These are theories according to which it matters not at all what we do or not at all what ethical theory we accept. I argue that it is generally rational to reject any theory of this kind. In Section III, I discuss what I call “relatively deflationary” ethical theories. These are theories according to which it matters little what we do or what ethical theory we accept. I argue that we have strong pro tanto reason to reject theories of this kind. And then, in Sections IV and V, I reply to some common objections to my arguments. Throughout, I will be arguing not that deflationary ethical theories are false but only that we should reject them from the practical point of view as a basis for guiding our actions.