Those who lie and cheat, but do not believe what they are doing to be wrong, may be living according to ethical standards. They may believe, for any of a number of possible reasons, that it is right to lie, cheat, steal and so on. They are not living according to conventional ethical standards, but they may be living according to some other ethical standards.
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About Peter Singer
Peter Singer was a contemporary Australian moral philosopher. Peter Albert David Singer is an Australian moral philosopher who is Emeritus Ira W. DeCamp Professor of Bioethics at Princeton University. Read more on Wikipedia →