MatthiasRussell wrote:

Tuvix was alive for some time in which time Tuvok and Neelix could and maybe should have been considered legally dead. Tuvix wasn't killed to save 2 lives, he was killed to bring 2 people back from the dead.
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If they were considered dead, then they never could have been brought back in the first place. The show starts off with the EMH saying that he can find a way to separate them to bring them back. The chief medical officer didn't consider or pronounce them dead, then there is no reason we should.