I liked how the Doctor refused point blank to split Tuvix into the other two characters, because of the Hippocratic Oath. I did find it strange, however, when Tuvix tried to flee the ship, he made a complete hash of it. I mean, he had Tuvok's knowledge, he could've just pre-programmed the computer to beam him and a shuttlecraft off the ship, and also could've disabled the warp engines of Voyager, and then escaped. Instead, he just tries to run away from the bridge. Like a jerk. He almost deserved to die.
Although, regarding Noami Wildman and Kim being copies, I don't think that matters at all. There was the "real" versions of Wildman and Kim, just as much as the ones who died.
