This has always been the case even with human society though. Few people will ever experience comparable stress to a combat situation, and the warriors will always have a rate of mental issues higher than almost anyone else.
Yes, but that raises the question "is the Horizon space fleet more like an army, or more like an astronaut corps?" Having danger signs for severe mental health issues might or might not get you put on leave in the former, but it definitely would in the latter.
If they have systems that automate the monitoring of mental health and are mindful of this kind of issue, you'd expect them to be
more mindful of it in high stress professions, not
less. "This person is in a high stress profession" is not a reason for you to not figure out the warning signs of their impending mental breakdown before it happens, if you're in the business of carefully watching people for signs of breakdown.
Which comes back around to my actual point: it makes little or no sense for the Harmony to have a system that has an effectively-zero failure rate normally, but that suddenly starts failing when dealing with starship captains. Far more likely that their system has a comparable failure rate across the board.
Further, the Harmony have acted to mitigate this issue. Consider their fleet organization. The ships that pose the most risk of a rogue captain being able to do something without being stopped by their own crew are the short-legged corvettes that automatically come in large groups (so that other corvettes can act to stop a rogue) and with a very powerful tender ship that can outmatch any single one that goes rogue. Only ships of at least heavy cruiser size are capable of independent operation. And they come with large crews ensuring that you need more than a handful of people to run the ship, that when the captain goes nuts there are enough people on the bridge to stop him, and that they can incorporate enough personnel to monitor the ship and take care of its security.
But see, that raises further questions: why are they uniquely worried about their captains
going mad? The Klingons have a huge number of small corvette-sized ships, and they don't have troubles like this- or rather, while I'm sure they occasionally have captains do something daft in pursuit of Honorglory, it doesn't seem to be such a problem that they have to seriously worry on a regular basis about rogue captains.
The Cardassians and the Romulans have problems like this maybe, but if so it has more to do with political loyalty, not with their officers going violently insane without warning.
We don't have problems like this, at least not on a regular basis.
But we've got at least two, maybe three, incidents where the Harmony attributed the
What I'm trying to get at is that we should maybe be asking the question:
If we take their core narrative at face value...
What is it about Harmony society, that makes sudden outbreaks of violent mental illness a recurring theme among their senior naval officers? What is it that makes their citizens, or at least their naval personnel, have this easily flipped switch? On one side of the switch they're the same kind of clever, rational, polished people we could easily imagine serving in Starfleet. On the other side,
if the Harmony's own descriptions are to be believed, they are capable of
piracy or, as we've recently seen, murder, when someone or something presses their buttons. For that matter, remember the time early in our interactions when one of their parasite craft seemed to be fleeing to our lines and broadcasting distress calls, but was reeled back in by the Harmony fleet before our ship responded? That may have been a similar incident.
So again, if we accept the Harmony's own narrative, it seems as though violent 'insanity' is lurking a pretty short distance beneath the surface for them. Why might that be, and what does it say about their society that we see them 'snap' so often?
Alternatively, if we
don't accept the Harmony's narrative (the crazy captain committing piracy was actually trying to bully the Tauni into rejoining the Harmony, the crazy captain who just committed murder on one of our ships was actually some kind of weird brainwashed agent, etc.)...
What does it say about the Harmony, that "other people are crazy" or "our people are crazy" or "this person is crazy" is their default go-to explanation for any strange or bad behavior?
...
This is where I come in and start talking about how the Harmony seems, de facto or intentionally, to be set up as the "narcissistic gaslighting space empire."