She certainly did. He was a new sentient being who pleaded for his life. I am glad that the Doctor at least would not participate.
He was sentient, but the incontrovertible fact is that his existence was the result of an accident, one that while it submerged the personas of Tuvok and Neelix, did not kill them. As long as the integrity of their separate personhoods could be restored, that eventuality had to take precedence over Tuvix's being able to survive, morally, ethically, in every sense. Janeway's action was in no way murder, but simply restoration.
Now what could have been done and I would certainly have supported it, would for Tuvix to have been cloned so that this distinct personality could have remained among the living and on board. If Wright would have been open to it, he could have made a subsequent appearance or two. The interaction between Tuvix and his progenitors face to face would have been, ah....interesting.
Oh, and by the way as far as the Doctor's participation went, I thought his refusal is understandable in the sense that many physicians would not willingly accept such a role as a violation of their charge as healers, as the Doctor recited at the end of Darkling. But in this instance, I think his seemingly sudden ethical stand, came out of nowhere and was borderline hypocritical. Presumably his continuing to pursue a means to reverse the process was not being done for purely academic reasons. If his research was successful, as one would assume he meant it to be, what else could've possibly been the outcome than what actually transpired? Was the Doctor really that oblivious? If his programming prohibited him from having to face proceeding with the obvious denouement of his work, than he should have refused to embark on it in the first place.
Whatever other instances of his being a maladjusted wiseacre and idiot, this was the only time i can remember thinking of him being a fucking dumbass.
I feel that Voyager shied away from having Janeway face the justice she deserved for murdering Tuvix: a court martial which would have found her guilty, stripped her of all her status as a Starfleet officer, and imprisoned her for life.
I have felt the same way. That episode made me feel physically sick and seriously consider not watching another episode of Voyager. I have to pretend it never happened in order to enjoy the show at all. It is my main reason for viewing Captain Janeway as my most disliked character in all of Star Trek.
I remember having a visceral action myself but she wanted her friends back. Her expression which the director asked Kate to do was disconcerting. Maybe if she looked mournful instead of kinda spiteful? eeek.
That wasn't my impression of her visage at all. I think that the seeming stony face was her means of not showing emotion, but my sense of watching her walking out of sickbay, was close to feeling that a part of herself had just died as well.