If everyone would indulge me here I would like to make a more "contemporary" application here.
Many people have the opinion and belief that life begins at conception. Therefore to kill the unborn child, in their minds, constitutes murder of a defenseless human being. However, from the fetus tissue stem cell research has the potential to maybe save lives.
If someone who held such a belief about abortion found themselves in a life or death situation that required them to allow a treatment that used stem cells would it be morally wrong for that person to do so? The killing of an unborn child was required to save their own life. It's an interesting dilemma and one I thought about when I saw this episode.
Kevin
Not an apt comparison, if I recall the episode correctly. They were using knowledge, not biological material gained from killing another (capable of developing sentience) individual.
I think it's a no-brainer to say that researchers shouldn't use unethical means to gain scientific knowledge.
But once that knowledge is there, no-one else is being hurt by utilising it. In fact, it's plausible that not using it results in a net gain in suffering - as it would have in this case.
B'Elanna refusing to benefit from that knowledge wouldn't have helped those experimented on, and wouldn't have made a blind bit of difference to the unethical researcher. All that would have resulted is her death, other people's grief, and a ship in dangerous straits needing a (necessarily less competent) chief engineer. I had no sympathy for her - she was being utterly selfish.