It would have been nice if the scientists of Prometheus were so true to character as you project onto Carol Marcus. But it's apparent that sticking to realistic science is not how Hollywood works. And in the case of TWOK - a Star Trek movie - I doubt they would write that level of scientific understanding into the script for a show so well known for its (supposed) non-interference protocols. Why would they spend time to promote such arcanery (to the lay person) above the Prime Directive in a Star Trek script? Does Star Trek most try to discuss chemistry or philosophy?
Okay. I don't think that's arcane. Like I said, that's basic high school science--and
way less obscure to a lay person than the PD, which hadn't been mentioned onscreen for thirteen years at that point.
And in the context of the movie, it seemed obvious that Carol was just focused on finding the right setting for her experiment, so that the whole exercise wasn't pointless.
Remember, this is Trek. If the movie had wanted to moralize about any ethical issues, it would have done so--and wouldn't have been subtle about it.
"But do we have the right to alter to interfere with this planet's natural evolution? Who are we to play God, even where a microbe is concerned?"
In fact, the PD is never mentioned once in the entire movie. And remember, to a lay person, the PD is
way more arcane than the idea of conducting experiments in a controlled, sterile environment.