This is one of those arguments that you reach when you go in a certain direction for long enough, and you can divide people into two camps at this point by whether:
* they triumphally declare victory--ethics is solved! We can finally Do The Most Good!
* or, it's so ridiculous that it occurs to them that they're missing something--must have taken a wrong turn somewhere earlier on.
By my tone you can probably tell I take the latter position, roughly because "suffering", or "moral value", is not rightly seen as measurable, calculatable, or commensurable, even between humans. It's occasionally a useful view for institutions to hold, but imo the one for a human.
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