Shelly Kagan

Many proposed moral principles are such that it would be difficult or impossible to always correctly identify which act is required by that principle in a given situation. To deal with this problem, theorists typically offer various methods of determining what to do in the face of epistemic limitations, and we are then told that the right thing to do – given these limitations – is to perform the act identified by the given method. But since the method and the underlying principle can diverge, it would seem that in such cases we are being given contradictory advice: some particular act will be both right and not right. Various attempts to resolve this apparent paradox are surveyed, but none are completely satisfactory.

Most intuitively forceful criticisms of utilitarianism, I believe, reduce to two basic objections. Both arise from the relentlessness of the utilitarian injunction to promote the overall good. On the one hand, this means that agents are permitted to perform an act of any kind whatsoever–provided only that the consequences of that act are better than those of any alternative. In particular, this means that it is permissible to impose tremendous sacrifices or injuries upon someone, if this is the only way to ensure even greater gains for others. But in allowing agents to deliberately impose harm on someone for the sake of others, utilitarianism seems to permit acts which are morally unacceptable. Intuitively, we want to say that rights, or other moral prohibitions, forbid treating people in certain ways–ways allowed by utilitarianism. This, then, is the first major objection: utilitarianism permits too much.