The Real Life Important Point about Being Moral or Ethical.

[Kripke]

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If you assume we have similar morals, deduction.

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But, deduction is simply a method of testing validity of arguments. Deduction is not a specific kind of logic. You might argue that a certain argument is valid because you can deduce the conclusion from the premises in modal logic. But someone who rejects the whole foundation of modal logic will not accept this argument, because he will argue that modal logic is flawed.

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If you assume we don't, induction.

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I'm not sure I even understand your suggestion here.

- Kripke