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Greene contra Ethics

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‘Science can advance ethics by revealing the hidden inner workings of our moral judgments, especially the ones we make intuitively. Once those inner workings are revealed we may have less confidence in some of [...] the ethical theories that are explicitly or implicitly based on them’

Greene (2014, pp. 695–6)

Aim is to understand and evaluate this claim.
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a loose reconstruction

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1. Ethical judgements are explained by a dual-process theory, which distinguishes faster from slower processes.

2. Faster processes are unreliable in unfamiliar* situations.

3. Therefore, we should not rely on faster process in unfamiliar* situations.

4. When philosophers rely on not-justified-inferentially premises, they are relying on faster processes.

5. The moral scenarios and principles philosophers consider involve unfamiliar* situations.

6. Therefore, not-justified-inferentially premises about particular moral scenarios, and debatable principles, cannot be used in ethical arguments where the aim is knowledge.

From glossary ...
A claim (or premise, or principle) is not-justified-inferentially if it is not justified in virtue of being inferred from some other claim (or premise, or principle).
Claims made on the basis of perception (That jumper is red, say) are typically not-justified-inferentially.
Why not just say ‘noninferentially justified’? Because that can be read as implying that the claim is justified, noninferentially. Whereas ‘not-justified-inferentially’ does not imply this. Any claim which is not justified at all is thereby not-justified-inferentially.
From glossary ...
A *fast* process is one that is to to some interesting degree cognitively efficient (and therefore likely also some interesting degree automatic). These processes are also sometimes characterised as able to yield rapid responses.
From glossary ...
An unfamiliar problem (or situation) is one ‘with which we have inadequate evolutionary, cultural, or personal experience.’ (Greene, 2014, p. 714).