endoself comments on What is Metaethics? - Less Wrong
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But that is not the answer if someone wants to murder someone. What you have here is actually a reductio ad absurdam o the simplistic theory that morals=desires.
If you don't want someone to murder, you can try to stop them, but they aren't going to agree to not murder unless they want to.
Want to before they have had their preferences re arranged by moral exhortation, or after?
I was referring to only fully logical arguments. Obviously it is possible to prevent someone from murdering by expressing extreme disapproval or locking them up.