In the episode [Demon](http://memory-alpha.wikia.com/wiki/Demon_(episode)), the crew of Voyager give their DNA to not only a pre-*warp* civilisation but a pre-*sentient* civilisation, changing the course of their natural evolution. This seems to me to be a clear violation of the Prime Directive which states that ship's captains should avoid interfering in the natural evolution of less advanced species.

**So why did Captain Janeway feel that she could violate the Prime Directive?**