Yes, but in order to restore Neelix and Tuvok you had to murder another sentient being.
And haven't we already discussed TNG's "Measure of a Man" which established that Data (and by extension other beings) have the right to determine their own path.
Tuvix had the right to live, It wasn't Janeway's life to take. Accidents happen.
And to allow that being to live you have to murder Tuvok and Neelix. All arguments can be easily reversed, because there is no answer. Only different points of view.
No... no one murdered Tuvok and Neelix. Tuvok and Neelix died in an accident, creating Tuvix. Tuvix was deliberately murdered to bring Tuvok and Neelix back to life.
There's all the moral difference in the world between an accident that was no one's fault and willfully murdering someone against their will.