Overdetermination and Obligation
This chapter is concerned with circumstances where a person’s act makes no difference to the occurrence of a negative outcome, but is a member of a group of acts that does make such a difference. In the light of an analysis of these circumstances, it argues against two familiar ideas. One is Derek Parfit’s view that the wrongness of an act directly depends on the consequences of the group of acts of which it is a member. The other is the view that intentions are irrelevant to permissibility. The chapter suggests that wrongness and permissibility, in these cases, is distinguished by the intentions of those who act. It also argues that intentions make a difference to a person’s liability to punitive, compensatory, and defensive harm. Finally, it briefly considers cases involving mixed motives.