Simply deciding not to help the Valakians to give the Menk a chance to evolve was bad enough, but what makes it even worse is that Phlox had the cure and he refused to give it to them. That's a serious breach of medical ethics, and I don't think any real doctor would ever do what he did.
yeah, this was what put it over the top in its horror. It's one thing if Phlox had refused to start looking for a cure, but he actually FOUND THE CURE and didn't give it to a dying race!
Phlox was like a guy with a big jug full of water standing there, staring at someone dying of thirst and just shaking his head.
If Phlox had these views on race and eugenics he shouldn't have gone into being a doctor in the first place.