Because deontological theories are best understood in contrast to consequentialist ones, a brief look at consequentialism and a survey of the problems with it that motivate its deontological opponents, provides a helpful prelude to taking up deontological theories themselves. Consequentialists hold that choicesacts and/or intentionsare to be morally assessed solely by the states of affairs they bring about. Consequentialists thus must specify initially the states of affairs that are intrinsically valuableoften called, collectively, the Good. They then are in a position to assert that whatever choices increase the Good, that is, bring about more of it, are the choices that it is morally right to make and to execute. (The Good in that sense is said to be prior to the Right.)

Consequentialists can and do differ widely in terms of specifying the Good. Some consequentialists are monists about the Good. Utilitarians, for example, identify the Good with pleasure, happiness, desire satisfaction, or welfare in some other sense. Other consequentialists are pluralists regarding the Good. Some of such pluralists believe that how the Good is distributed among persons (or all sentient beings) is itself partly constitutive of the Good, whereas conventional utilitarians merely add or average each person's share of the Good to achieve the Good's maximization.

Moreover, there are some consequentialists who hold that the doing or refraining from doing, of certain kinds of acts are themselves intrinsically valuable states of affairs constitutive of the Good. An example of this is the positing of rights not being violated, or duties being kept, as part of the Good to be maximizedthe so-called utilitarianism of rights (Nozick 1974).

None of these pluralist positions erase the difference between consequentialism and deontology. For the essence of consequentialism is still present in such positions: an action would be right only insofar as it maximizes these Good-making states of affairs being caused to exist.

However much consequentialists differ about what the Good consists in, they all agree that the morally right choices are those that increase (either directly or indirectly) the Good. Moreover, consequentialists generally agree that the Good is agent-neutral (Parfit 1984; Nagel 1986). That is, valuable states of affairs are states of affairs that all agents have reason to achieve without regard to whether such states of affairs are achieved through the exercise of one's own agency or not.

Consequentialism is frequently criticized on a number of grounds. Two of these are particularly apt for revealing the temptations motivating the alternative approach to deontic ethics that is deontology. The two criticisms pertinent here are that consequentialism is, on the one hand, overly demanding, and, on the other hand, that it is not demanding enough. The criticism regarding extreme demandingness runs like this: for consequentialists, there is no realm of moral permissions, no realm of going beyond one's moral duty (supererogation), no realm of moral indifference. All acts are seemingly either required or forbidden. And there also seems to be no space for the consequentialist in which to show partiality to one's own projects or to one's family, friends, and countrymen, leading some critics of consequentialism to deem it a profoundly alienating and perhaps self-effacing moral theory (Williams 1973).

On the other hand, consequentialism is also criticized for what it seemingly permits. It seemingly demands (and thus, of course, permits) that in certain circumstances innocents be killed, beaten, lied to, or deprived of material goods to produce greater benefits for others. Consequencesand only consequencescan conceivably justify any kind of act, for it does not matter how harmful it is to some so long as it is more beneficial to others.

A well-worn example of this over-permissiveness of consequentialism is that of a case standardly called, Transplant. A surgeon has five patients dying of organ failure and one healthy patient whose organs can save the five. In the right circumstances, surgeon will be permitted (and indeed required) by consequentialism to kill the healthy patient to obtain his organs, assuming there are no relevant consequences other than the saving of the five and the death of the one. Likewise, consequentialism will permit (in a case that we shall call, Fat Man) that a fat man be pushed in front of a runaway trolley if his being crushed by the trolley will halt its advance towards five workers trapped on the track. We shall return to these examples later on.

Consequentialists are of course not bereft of replies to these two criticisms. Some retreat from maximizing the Good to satisficingthat is, making the achievement of only a certain level of the Good mandatory (Slote 1984). This move opens up some space for personal projects and relationships, as well as a realm of the morally permissible. It is not clear, however, that satisficing is adequately motivated, except to avoid the problems of maximizing. Nor is it clear that the level of mandatory satisficing can be nonarbitrarily specified, or that satisficing will not require deontological constraints to protect satisficers from maximizers.

Another move is to introduce a positive/negative duty distinction within consequentialism. On this view, our (negative) duty is not to make the world worse by actions having bad consequences; lacking is a corresponding (positive) duty to make the world better by actions having good consequences (Bentham 1789 (1948); Quinton 2007). We thus have a consequentialist duty not to kill the one in Transplant or in Fat Man; and there is no counterbalancing duty to save five that overrides this. Yet as with the satisficing move, it is unclear how a consistent consequentialist can motivate this restriction on all-out optimization of the Good.

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Deontological Ethics (Stanford Encyclopedia of Philosophy)