Philosophy
Moral Luck and the Control Principle
Quick fact
Thomas Nagel, who coined the term 'moral luck' in 1979, argued that if we take the control principle seriously, moral luck is paradoxical: we judge people for things they couldn't control.
Why this is interesting
Imagine two reckless drivers: one swerves and hits no one, the other kills a pedestrian. Most people judge the second driver more harshly, but is that fair? Both had the same intention and same lack of care—only luck differed.
Read the full explanation
Understanding Moral Luck and the Control Principle
Think of moral evaluation as a scale. Intuitively, we want to weigh only the choices a person controls: their intentions, efforts, and decisions. This is the control principle: you are morally accountable only for what is within your voluntary control. But life doesn't cooperate. Consider a clumsy person: if they knock over a vase, they might be slightly embarrassed; if they knock over a priceless Ming dynasty vase, they are severely blamed. Their action was identical—just the outcome changed. This is moral luck: when a person's moral standing (blame or praise) is partly determined by factors beyond their control, like consequences, circumstances, or even their own character. Nagel's insight is that these cases aren't rare—they are everywhere. A soldier who kills in war is judged differently from a civilian who kills, though both might be equally unwilling. A person born with a generous nature is praised for their kindness, though they didn't choose their temperament. The understanding step is to see that moral luck forces us to choose: either reject the control principle (and admit fairness is impossible) or accept that we are less responsible than we feel.
A deeper explanation
The heart of moral luck lies in a contradiction. The control principle seems self-evident: we cannot be blamed for what we couldn't prevent. Yet our moral practice is saturated with judgments that violate it. Nagel distinguished four types of moral luck: (1) resultant luck—luck in how things turn out (the driver who hits a child vs. one who doesn't); (2) circumstantial luck—luck in the situations you find yourself in (being in Germany during the Holocaust vs. being elsewhere); (3) constitutive luck—luck in your character, inclinations, and capacities (being born patient vs. quick-tempered); and (4) causal luck—luck in how your actions are determined by prior causes (the whole chain of events leading to your decision). Each type chips away at the idea that we truly control what we do. Why does this matter? It forces philosophers to rethink moral responsibility. Some argue we should abandon the control principle and accept a qualified kind of responsibility based on character or social roles. Others, like Bernard Williams, suggest we should embrace moral luck as an inescapable part of ethics, even if it clashes with our rational intuitions. The debate isn't academic: it affects how we design legal systems (criminal intent vs. outcome), how we understand guilt and shame, and how we treat criminals or heroes. Moral luck reveals that our ethical judgments are often messier than we'd like—but understanding that mess is the first step toward more nuanced ethics.