Phlox said to Archer that he found the cure to their disease and then talked Archer into withholding that cure.
What part of that didn't you get?
I wasn't sure if that was the episode you were referring to or not.
Now, as to the subject matter: I'm not sure that withholding a cure meets the technical definition of genocide. I looked up the dictionary definition and you could definitely argue it either way. Clearly you DO think it constitutes genocide. Without the existence of the second sapient species on that planet, the argument against withholding the cure would be a lot tougher to make. Even with them, it's a hard, hard call.
That's why this episode is one of my favorite episodes of Trek, period. The decision IS morally ambiguous, no matter which side of the argument you come down on. Withholding a cure from the natives is not the same thing as phasering the surface of the planet and destroying their civilization; more a matter of letting nature take its course, which is something the Federation does in later centuries with often horrific results for those left to their own fate.
What would have made an interesting follow up to this episode (and again, here's another argument for arc-driven seasons like we're going to see in DSC), was what the public reaction would have been on Earth and Deboula and within the ranks of the IME if Enterprise's mission logs concerning this world were made public. Imagine the populations of two worlds embroiled in an ethical and moral debate about how the situation was handled, to include teams of 'rogue' doctors attempting to travel there and perhaps running a Starfleet blockade to supply the cure to the locals. (Or rogues attempting an information raid on Starfleet HQ to obtain the system's coordinates)
Talk about stumbling blocks in the way of forming the Federation in the first place! This sort of stuff should have been some of the meat and potatoes of the series, not a one-off episode where the species and their fate is never even brought up again.
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