[xorbie]

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Who is most likely to know someone's preferences and act in the best way to achieve them?

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Why do you think it is reasonable that this sort of question should have a simple answer? Sometimes the person himself. Sometimes someone else.

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Examples of these "sometimes" please.

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Already given.

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They may not be perfect but they are the best.

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No. If you think about, for example, children, you can why this is wrong. Just carry it to the logical conclusion

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Who didn't see that one coming? Children make bad decisions, so we can't let YOU make decisions for yourself.

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As soon as you explain why children magically become adults at age 18 (or whatever other age you'd like), I'll start to take this objection seriously.

And, of course, I'm not trying to stop people from making decisions themselves.