Devil's advocate for why ontology is meaningless and vacuous.

[JuliaL]

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Given that subjective preferences are mediated by objectively measurable neural configurations, I think it's premature to declare morality subjectivity.

Let's assume that "objectively true" means there's an isomorphic map-territory relationship (correspondence theory of truth). If someone empathizes with my mental state--which is to say, simulates my sentiments by experiencing (via mirror neurons) what I'm experiencing, that they have true information about a part of reality (me).

This is not only objectively true, but it entails that the empathizing person will not cause me gratuitous suffering. In order to justify causing other people suffering, we have to shut off our capacity for empathy, by demonizing people, or regarding them as animals, or insane, etc. I think that when you cash it out, this amounts to the kind of moral ontology you get from contractariansim, due to the fact that determining values by emulating the mental states of others via mirror mirror neurons is practically identical to determining values by rational agents behind a veil of ignorance.

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When was it established that morality inherently entails minimizing suffering? Or that acts of capriciousness and prejudice aren't moral?

I'm with ANKA here.  My model, in which morality is an observed emergent property of replicating, evolving systems allows morality to be subjective and contextual.  Proving objectivity of morals (correspondence with a reality agreed to be tentative) is just as impossible as proving we have true access to that reality in the first place.  
Though someone empathizing with Gemini might have "true information about a part of reality."  They cannot know that that information is true.
We do, in good conscience, treat others with varying degrees of empathy.  I do not feel the same disquiet over the starving children in Africa as I do over my own starving children.  It is no coincidence that those who I feel most responsible for are those who are my closest relations.
Gemini might find it good that others feel her pain, but is that pain good for the others?