Abstract

I consider cases in which risk or ignorance create barriers to our discovery of what we ought to do. I argue that neither expected utility theory, nor the maximin principle, nor a timid gambling temperament, is relevant to discovering what we ought to do in one-off or infrequently recurring types of decisions involving risk, or to decisions involving ignorance. I argue, contra Kolodny and MacFarlane, that the miners case does not require us to give up any classical logical principle in order to avoid contradiction. I reject Graham’s claim that the appearance of contradiction depends upon a confusion between acting rightly and not being blameworthy. In the cases of risk and ignorance discussed, we cannot know what we ought to do; and any way of deciding what we shall do is objectively arbitrary even if it reflects our gambling temperament. Subjective probability and the subjective ought should be repudiated.