Okay been thinking about this for a few days.Therefore, it stands to reason that previous Starfleet / Federation visitors to Ardana had not explored the planet thoroughly enough to be aware of the full situation.
Would a visitor to Ardana realize that the some of the troglytes had a work place created mental defect? Droxine said the troglytes are workers, they mine zenite and till the soil. We also know that troglytes are servants and police.
We have no idea of Ardana's population, however in America today out of a population of 330 million there are about four million farmers, one and a half million fishermen, and a third of a million raising livestock. Miners are in the tens of thousands.
So, not only wouldn't a visitor reasonable be expected to figure out the miners have a special problem, neither would the Ardana general population.
And given that they don't really care about the troglytes as a over all group, the fact that a fraction of one percent of them are being effect by zenite gas probably wouldn't be noticed by the Ardana leadership either.
Nothing was being "hidden."
If Ardana has industry, and the troglytes work there as well, then the fraction of one percentage who are miners of zenite would be smaller still, and even less noticeable.
Droxine: "The troglytes are workers, Captain."
No, the episode really doesn't.The episode makes it quite clear that the truth of the Troglytes' oppression has been hidden from the Federation.
That relatively few people live in (can live in) the small floating city, well that pretty obvious. That the majority of the population are workers of one sort or another, and not members of the elite, that's out in the open too.
That last is probably the norm on all Federation planets.
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