Moral relativism claims that statements are true or false based on who is saying them: they include
indexicals in the same way that the truth of the statement "I am in Senegal" is dependent on who is making that statement. Depending on the variety of moral relativism, these statements may be indexed to a particular society (i.e.,
cultural relativism, when I say stealing is wrong, it is only true if stealing is not acceptable in my culture), or indexed to an individual (individualistic relativism). Furthermore, moral relativism is the view where an actor's moral codes are locally derived from their culture. The rules within moral codes are equal to each other and are only deemed "right" or "wrong" within their specific moral codes. Ethical subjectivism is a completely distinct concept from
moral relativism. Ethical subjectivism claims that the truth or falsehood of ethical claims is dependent on the mental states and attitudes of people, but these ethical truths may be universal (i.e. one person or group's mental states may determine what is right or wrong for everyone). The term "ethical subjectivism" covers two distinct theories in ethics. According to cognitive versions of ethical subjectivism, the truth of moral statements depends upon people's values, attitudes, feelings, or beliefs. Some forms of cognitivist ethical subjectivism can be counted as forms of realism, others are forms of anti-realism.
David Hume is a foundational figure for cognitive ethical subjectivism. On a standard interpretation of his theory, a trait of character counts as a moral virtue when it evokes a sentiment of approbation in a sympathetic, informed, and rational human observer. Similarly,
Roderick Firth's
ideal observer theory held that right acts are those that an impartial, rational observer would approve of.
William James, another ethical subjectivist, held that an end is good (to or for a person) just in the case it is desired by that person (see also
ethical egoism). According to non-cognitive versions of ethical subjectivism, such as emotivism, prescriptivism, and expressivism, ethical statements cannot be true or false, at all: rather, they are expressions of personal feelings or commands. For example, on
A. J. Ayer's emotivism, the statement, "Murder is wrong" is equivalent in meaning to the emotive, "Murder, Boo!" While moral relativism and ethical subjectivism positions are often held together, they do not entail each other. For example, someone that claims that whatever their king wants to happen is the morally right thing for everyone to do would be an ethical subjectivist (right and wrong are based on mental states), but they would not be a moral relativist (right and wrong are the same for everyone). Conversely, a moral relativist could deny moral subjectivism if they thought that the morally right thing to do was to follow the written laws of your country (this morality is relativist since "the laws of your country" picks out different laws for different individuals, but not subjectivist since it is dependent on the written laws, which are not in anyone's head). Some
universalist forms of subjectivism include
ideal observer theory (which claims that moral propositions are about what attitudes a hypothetical ideal observer would hold). Although
divine command theory is considered by some to be a form of ethical subjectivism, defenders of the perspective that divine command theory is not a form of ethical subjectivism say this is based on a misunderstanding: that divine command proponents claim that moral propositions are about what attitudes God holds, but this understanding is deemed incorrect by some, such as
Robert Adams who claims that divine command theory is concerned with whether a moral command is or isn't "contrary to the commands of (a loving) God". == Terminology ==