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Replying to @michael_nielsen
Or: our moral knowledge is as fallible and error-ridden as our scientific knowledge, and equally open to & worthy of improvement. Evils are due to specific moral errors (e.g. Slaves aren’t people, but property. X is an inferior race, and should be destroyed. God says to kill Y.)
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Replying to @dela3499
This is at most a small part of what's going on. In the case of many - my guess is, most - bad acts, the person performing the act knows that it's bad. They don't lack moral knowledge; they just lack the willingness to act on it.
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Replying to @michael_nielsen @dela3499
I read the words of a bunch of slaveholders once - I do not recall the source. But it was very striking: they knew what they were doing was wrong.
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Of course, you are quite correct that there have been genuine instances of progress in our ethical knowledge.
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