You obviously think it's wrong to rectify life-theft (or the closest thing, reversible organ theft), so I'll just leave you with that.
Let's talk about the child whose birth causes the death of his mother, Anwar.
He did not plan for his mother to die, he did not act to kill his mother, indeed, no action in his power at birth could have saved his mother.
English has a word for it - INNOCENT. The new-born is innocent, he has nothing to do with his mother's death.
In exactly the same way, Tuvix is innocent of the circumstances of his birth, of what you call 'organ theft'. Do you understand? Innocent as in NOT guilty.
A mother dying in the birth of the child? Sad, but it was her choice to have the child and live with the consequences (or not live, in this case). Tuvok and Neelix were never asked, nor had a choice.
Tuvok and Neelix weren't "sick" or "dying", they were trapped in a state of non-life (basically, a fate worse than death) and were TOTALLY retrievable. However, a third guy who was the result of their fate worse than death who was looking out for himself refused to do anything to help either of them.
You don't abandon two living, healthy people just because the guy who basically stole their lives said so.
Tuvok/Neelix were the exact equivalent of a sick person on the death bed - almost dead, but not quite there.
You don't want to acknowledge this because that would mean acknowledging that that Dr Mengele wannabe - Janeway - killed an INNOCENT person to harvest her organs and save two sick/dying persons.
Tuvok/Neelix were not responsible in any way for their affliction?
Well, most sick people are not responsible in any way for their disease/injury. This DOESN'T CHANGE THE FACT THAT THESE SICK PEOPLE DON'T HAVE THE RIGHT TO KILL INNOCENT SENTIENT BEINGS JUST SO THAT THEY GET CURED, Anwar.
And Tuvix refused to sacrifice himself in order to save Tuvok/Neelix? THAT IS HIS RIGHT AS A SENTIENT BEING, Anwar. HE HAS THE RIGHT TO LIVE AND DECIDE WHAT TO DO WITH HIS OWN LIFE, Anwar.
You don't abandon two living, healthy people just because the guy who basically stole their lives said so. It's cruel, unfair to them, and generally a mockery of life. Janeway did the right thing as Captain.
You obviously think it's wrong to rectify life-theft (or the closest thing, reversible organ theft), so I'll just leave you with that. I'm done with this.
Welcome in Anwar's reverse world!
Tuvix, guilty of organ theft? Yeah, sure - sarcasm. I have just spelled out for you how ridiculous this idea is.
Healthy persons?
Sure - Tuvok/Neelix will become healthy again after they receive the organs stolen by Dr Mengele from an innocent, sentient being she killed.
You know who else would exhibit the exact same behaviour? Sick persons who receive transplanted organs.
Well, I guess Tuvok/Neelis would be healthy persons in your reverse world, Anwar.