Ethics

Consequentialism holds that the moral worth of an action is determined entirely by its outcomes. Act utilitarianism (Bentham, Mill) says the right action maximizes overall happiness. Rule utilitarianism says we should follow the rules that, if generally followed, would maximize overall happiness. Preference utilitarianism (Singer) says we should maximize preference-satisfaction. The tradition is intuitive — of course consequences matter — but struggles with counterexamples that seem to license obvious wrongs in pursuit of good outcomes.

Deontology holds that some actions are intrinsically right or wrong, regardless of their consequences. Kant's deontology grounds morality in rational duty: the Categorical Imperative demands that we act only on principles we could will to be universal laws, and that we treat persons always as ends, never merely as means. Rights-based deontology (Nozick) grounds morality in individual rights that cannot be violated even for good outcomes.

Virtue ethics, revived in the 20th century by Elizabeth Anscombe, Alasdair MacIntyre, and Philippa Foot, returns to Aristotle's question: what kind of person should I be? Rather than asking what to do, it asks what character traits enable human flourishing. Courage, justice, practical wisdom, temperance — these virtues are not rules to follow but stable dispositions to cultivate through practice.

Underlying all ethical theory is a deeper question: are moral claims objectively true or false, or are they expressions of attitude, convention, or cultural preference? Moral realism holds that there are objective moral facts — that "torturing innocents for fun is wrong" is as true as "the sun is a star," and true independently of what anyone believes or feels about it. This is the natural assumption of most moral discourse.

Moral anti-realism comes in several forms. Emotivism (A.J. Ayer, Charles Stevenson) holds that moral statements express emotional attitudes rather than stating facts: "Murder is wrong" means something like "Boo to murder!" Error theory (J.L. Mackie) holds that moral discourse makes objective claims but that all these claims are false — there are no moral facts in the world. Constructivism (Rawls, Korsgaard) holds that moral truths are constructed by rational procedures rather than discovered in a mind-independent realm.

The stakes are high. If moral anti-realism is correct, then moral disagreements are not like factual disagreements — they cannot be resolved by finding out more facts. They can only be managed, negotiated, or ended by force. The history of political violence suggests this is a grim outcome.

Applied ethics is the discipline that brings philosophical analysis to bear on specific moral problems: bioethics (abortion, euthanasia, genetic enhancement), environmental ethics (our obligations to animals, future generations, ecosystems), political ethics (justice, war, global inequality), and professional ethics (medicine, law, business). It is the most rapidly growing area of philosophy, partly because the 20th and 21st centuries have generated genuinely new ethical problems — from nuclear weapons to climate change to artificial intelligence — that no historical tradition was designed to address.

Peter Singer's work exemplifies applied ethics at its most demanding. His argument for animal liberation — that the capacity to suffer, not species membership, is the relevant criterion for moral consideration — follows straightforwardly from utilitarian premises but leads to conclusions (radical veganism, massive reduction in animal agriculture) that most people find practically challenging. His effective altruism movement argues that affluent people in wealthy countries are morally obligated to donate substantial portions of their income to combat extreme poverty. These are philosophy-derived positions with immediate practical implications.