There was a Voyager episode where an alien species using stealth tech was performing various medical experiments on the Voyager crew to further their treatment of various ailments. Suffice to say that when the Voyager crew uncovered the alien experiments, they were not agreeable to continue. In fact, Captain Janeway was willing to destroy Voyager to stop the experimentation. And the lead alien scientist made the same pitch to Janeway about how the experiments would help many others. Janeway rejected the argument.

> I would absolutely turn myself over to alien science if the need was great enough, especially if my quality of life was heading downhill, but only if I knew it would benefit the rest of you.

That's noble of you, but I'd rather the aliens left us alone if it was between that and experimenting on us for their (or our) own good. No thanks.