Re: Janeway's Decision to Kill Tuvix
^ No, because no human being who ever existed was created via the same method that Tuvix was. There's no "real-life transporter accidents" which eliminated two people and reconstituted one person from the combination of the two. That is an exactly unique circumstance.
Also, if Tuvok and Neelix lived on while Tuvix existed, then Tuvix lived on as part of Neelix and Tuvok, since IIRC both of them remember being Tuvix.
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