Moreover, can we ever be really certain about all of the consequences of our actions? Our ability to measure and to
predict the benefits and harms resulting from a course of action or a moral rule is dubious, to say the least.
Perhaps the greatest difficulty with utilitarianism is that it fails to take into account considerations of justice. We can imagine instances where a certain course of action would produce great benefits for society, but they would be clearly unjust. During the apartheid regime in South Africa in the last century, South African whites, for example, sometimes claimed that all South Africans—including blacks—were better off under white rule. These whites claimed that in those African nations that have traded a whites-only government for a black or mixed one, social conditions have rapidly deteriorated. Civil wars, economic decline, famine, and unrest, they predicted, will be the result of allowing the black majority of South Africa to run the government. If such a prediction were true—and the end of apartheid has shown that the prediction was false—then the white government of South Africa would have been morally justified by utilitarianism, in spite of its injustice.
If our moral decisions are to take into account considerations of justice, then apparently utilitarianism cannot be the sole principle guiding our decisions. It can, however, play a role in these decisions. The principle of utilitarianism invites us to consider the immediate and the less immediate consequences of our actions. Given its insistence on summing the benefits and harms of all people, utilitarianism asks us to look beyond self-interest to consider impartially the interests of all persons affected by our actions. As John Stuart Mill once wrote:
The happiness which forms the utilitarian standard of what is right in conduct, is not...(one's) own happiness, but that of all concerned. As between his own happiness and that of others, utilitarianism requires him to be as strictly impartial as a disinterested and benevolent spectator.
In an era today that some have characterized as "the age of self-interest," utilitarianism is a powerful reminder that morality calls us to look beyond the self to the good of all