The origins of the concept of moral blindness lie in philosophy and can be traced to ancient Greek philosophers such as Socrates who spoke of moral intellectualism, Plato who spoke about emotions clouding moral judgements, and Aristotle who first used the term "ethics" for the field of moral philosophy. Early spiritual leaders such as the Buddha and Confucius also spoke about moral behaviour in their discourses although they were more prescriptive in nature. Modern contributions to moral judgement came from Western philosophers such as Descartes, Locke, Hume, and Kant around the 17th and 18th century and more contemporary philosophers such as G.E. Moore, who in his book Principia Ethica talks about the "indefinability of good".
A major driver for modern research on moral blindness is purported to be post World War II sentiments towards people such as Adolf Eichmann (responsible for genocide under the Nazi regime during the Holocaust). His capture and subsequent trial in 1961 had many observers comment on his ordinary nature and appearance which seemed at contrast with his 'evil' behaviour. Hannah Arendt, who was covering the trial for the New Yorker, coined the term the "banality of evil" in reference to Eichmann as during the trial, Eichmann showed no remorse nor did he accept responsibility - he claimed to have done what he was told to do. This is believed to have influenced researchers such as Milgram to study individual behaviour in response to obedience to authority.
In his obedience studies in 1961-62, Milgram had subjects think they were administering electric shocks to another participant, who in fact was a confederate of the experimenters. These studies had been designed to answer questions such as: "Could it be that Eichmann and his million accomplices in the Holocaust were just following orders? Could we call them all accomplices?" To most people's surprise, 65% of the subjects from the original study went ahead to pull a switch that would have administered the maximum of 450 volts.
More recent research has led to the development of the concept of 'bounded ethicality" - the idea that people can be unintentionally unethical when it comes to their behaviour as well as judging others' behaviour; something they may realise only on further reflection. Studies on individual unethicality have also looked at the role of social norms and as well as how we view others' unethical behaviour.
Moral blindness has been studied and applied in a range of domains beyond war crimes, politics, and administration. A major area of application has been in the field of management and organisational behaviour with research looking at a wide range of topics such as corporate transgressions, business ethics, and moral disengagement at work. Law and justice is another area where moral blindness, especially when it comes to lawyers, is seen as a concern. Some research has also referred to psychopathy being a specific kind of moral blindness although the findings are not conclusive.
The field has also been expanded to study broader ideas such as moral blind spots (overestimating ability to act ethically), ethical erosion (gradual decline of ethics over time), and ethical fading (when ethical concerns around a situation 'fade' during decision making).
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