SilentCal comments on Does utilitarianism "require" extreme self sacrifice? If not why do people commonly say it does? - Less Wrong
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Isn't a "boolean" right/wrong answer exactly what utilitarianism promises in the marketing literature? Or, more precisely doesn't it promise to select for us the right choice among collection of alternatives? If the best outcomes can be ranked--by global goodness, or whatever standard--then logically there is a winner or set of winners which one may, without guilt, indifferently choose from.
From a utilitarian perspective, you can break an ethical decision problem down into two parts: deciding which outcomes are how good, and deciding how good you're going to be. A utility function answers the first part. If you're a committed maximizer, you have your answer to the second part. Most of us aren't, so we have a tough decision there that the utility function doesn't answer.