Here's my thoughts on the matter.
Unless we kidnap, trick, force, or otherwise clone someone unwillingly, it don't see how it is wrong. If it CAN be done for the good of man, then can we not clone someone? I really don't see any harm in a more than willing subject.
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(20000 Leagues, great book. read an exert from it.)
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also, Nautica has a valid point. No one will be an exact copy of another (unless you [somehow] incorporate their memories and personality as well). However, psychological development, as well as physical treatment, DO NOT factor into cloning. If you kick a baby (never have), they might have a scar there for the rest of their life. Just because you clone someone DOES NOT mean that they will, inevitably, grow up, maybe not even go through the same developmental patterns, the same way.