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It does beg a question: specifically, the question of whether I ought to implement my preferences (or some approximation of them) in the first place. If, for example, my preferences are instead irrelevant to what I ought to do, then time spent working out my preferences is time that could better have been spent doing something else.

All of that said, it sounds like you're suggesting that suffering is somehow unrelated to the way evolution set up our values. If that is what you're suggesting, then I'm completely at a loss to understand either your model of what suffering is, or how evolution works.