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Is there a "best" or "better" method of judging the value of human life, so as to provide the most benefit to the most people?

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There are probably "better" methods... but no "best", as the value judgements will be subjective.

I think this is the main problem with Utilitarianism (from what I know of it). How can you measure utility? Happiness? Pretty hard to do... especially when we aren't even very good at knowing what makes us happy.