1. Did Janeway murder Tuvix?
2. Should it have been her decision without his having a chance to defend himself in a court of some sort? Should she have at least discussed the matter with others, including the Dr. and Kes & Chakotay?
3. Why didn't anyone try to stop her if they thought it was murder? Did they think it was murder? Did the Dr. think it was murder?
4. Why did Tuvix go so quietly?
5. Why didn't anyone hold it against Janeway or ever mention it again?
6. Should it have been a two story arc to address questions 2-5?
1. No. Tuvix was a recombinant formulation of the essence that was still Tuvok and Neelix. They still existed and there was no justification to allow the usurper to continue to deny them being manifested again. If Janeway's act was actually murder, than two lifeless clumps of matter would have materialized.
2. Yes. To quote Chokotay, "She's the captain". If she felt it would help
her decison making process she could have sounded others out, but ultimately Voyager's not a democracy (as if that really needs to be stated!!!).
3. Speculative, see next. No. While it was probably difficult for many to know how to emotionally respond at that moment, they all likely reached the same conclusion as Janeway, given the inescapable reality of the situation. Sort of. Prima facie,the Doc did find that the act would violate the ethics of his profession that his programming swore him to uphold. This begs the question as to why he pursued developing a solution at all, or at least informing Janeway when he came up with this one, when he had to realize what the consequences would be. Dumbass. On the other hand, one can argue that he didn't define it as murder, at least upon greater reflection, as he didn't throw it up to her at the end of Renaissance Man.
4. He knew there was no way out. Having Tuvok's memories, he certainly was aware of Janeway's steadfastness after making a determination, certainly of this magnitude. Someone with a more malign view of the character might suggest that Tuvix resigned himself to take the high road at the end so as to make even more acute the uneasiness felt by those witnessing his reorientation.
5. See part 2 of question 2.
6. Probably not. Another episode would have allowed the mostly positive identification the crew (and audience) felt for Tuvix to be furthered, making the inevitable denouement even more emotionally fraught. While greater examination of questions of morality and ethics in the show would not have been unwelcome IMO, in this instance another full act would not have changed the fundamental nature of the case. As I said recently in another thread though, his being cloned to live on would have been more than acceptable. He could have contributed notably to the furtherance of Voyager's journey, anecdotally at least, somewhere on the lower decks. Also, on those couple of occasions the writers might have dealt him back in, we would have had an opportunity to see the interesting dynamic of his interacting with his relations.