There are thus at least four types of moral error: errors of reasoning in particular cases, and mistakes of fact in such cases, then errors of reasoning in the construction of our value system, and mistakes of fact in such constructions. And these four kinds of error are inevitably frequent and intertwined: for we are often ignorant of or incorrect about relevant facts or deductions in any given case of moral decision (as many of us are in the construction of our worldview, from which we derive our value system). It is the role of the ethical philosopher and moral critic to spot and correct
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