A sentient being's right should always come before any rights a non-sentient being has.
At the point Janeway's decision to force the procedure on Tuvix there was absolute proof that Tuvix was sentient and absolute proof that he wanted to live. There was no proof that Tuvok or Neelix were sentient. Therefore Tuvix right to life should have trumped any rights that Neelix and Tuvok had at that point.
And Kes's feelings should not have been taken into account at all. Someone right to life is a much stronger right than some being 'right to be with the man she loved". Nor should Voyager's need for their two crew members have trumped Tuvix's right to life. If Tuvok was killed at any time in the voyage the crew would have adapted, and they certainly would have had no trouble managing without a cook.
At the point Janeway's decision to force the procedure on Tuvix there was absolute proof that Tuvix was sentient and absolute proof that he wanted to live. There was no proof that Tuvok or Neelix were sentient. Therefore Tuvix right to life should have trumped any rights that Neelix and Tuvok had at that point.
And Kes's feelings should not have been taken into account at all. Someone right to life is a much stronger right than some being 'right to be with the man she loved". Nor should Voyager's need for their two crew members have trumped Tuvix's right to life. If Tuvok was killed at any time in the voyage the crew would have adapted, and they certainly would have had no trouble managing without a cook.