Checkmite
Skepticifimisticalationist
And yet the Havana syndrome (Wikipedia) spread from CIA agents to Canadian diplomats.
What you are acknowledging here is that the "ailment" - being mass hysteria in this case - is contagious, after a fashion; which means removing people from the environment of the "contagion" when that is easily possible is a common-sense safety precaution. In the Emirates Flight 203 hysteria incident, step one was to get everybody off the plane.
Why do you think, literally, that the alternative is "to insist nothing is wrong while sending more staff and inevitably continuing to create new hysteria cases"? Is that what a single one of the many recommended treatments or interventions suggests? Why did you try to "find anything in the researchable internet literature about mass psychogenic illness that suggests a simple authoritative announcement that nothing is wrong and all the symptoms are entirely in the sufferers' own heads," instead of reading what they actually recommend?
What they actually recommend is consistent with Canada's action.
What Canada is doing, insofar as removing sufferers from the environment, is precisely the correct response. According to this article from the American Academy of Family Physicians (note the bold),
Recognizing mass psychogenic illness is a critical first step for all health care professionals in appropriately responding to such outbreaks. Approaches to handling mass psychogenic illness are outlined in Table 3. Once the diagnosis is determined, reassuring patients is the primary therapy. Separating them can be beneficial.9,10 Most patients experience rapid resolution of symptoms once they are removed from the environment in which the outbreak started. In treating individual patients, it is important to acknowledge that although no toxic cause of their illness has been identified, the person's symptoms are real. A diagnosis of mass psychogenic illness is not equivalent to saying that the symptoms are just “in the patient's mind.” It is also important to emphasize that mass psychogenic illness affects normal, healthy persons and does not imply underlying psychopathology.
That last part, is particularly important. Mass psychogenic illness doesn't have a biological cause but the symptoms are real, which means deliberately exposing people to the triggering environment without adequate protection (which there is none) is unethical. This can't be helped if the environment is a town, or even something more specific like an apartment building where people have to live and continue living, or a school where children have to continue attending; but that's not true of a voluntary foreign posting, as Canada's decision illustrates.
And lest anyone perchance to interpret the first sentence of that quoted paragraph to imply that "recognizing mass psychogenic illness" means that Canada should be publicly pronouncing the whole business to be a case of mass hysteria right now, that is not the case. The same article outlines two admittedly imperfect strategems, each with potential drawbacks:
In approaching mass psychogenic illness, the goal should be to restore individual persons and the community to routine function as quickly as possible. Prompt and definitive identification and labeling of episodes has been advocated as important in terminating them,22 but such an approach can be very difficult in practice. Labeling an outbreak as psychogenic may minimize unnecessary testing and halt spread, but the perception of a less than thorough investigation can lead to mistrust and anger.
Another strategy involves reassuring patients while avoiding naming the illness. This approach does not provide a “diagnosis,” and the absence of an identified source may lead to continued concern, symptom spread and increased testing.
"Restoring the community to routine function" does not apply in this case because as already mentioned, the hysteria did not spread in the patients' own community; that is to say, none of them after recovering is going to have to return to this place to live and work. This was a foreign place that none of them is ever going to have to visit again. If Canada is employing either of these approaches it would appear to be the second one; although they have a unique advantage that abrogates the downside: if the trigger for developing symptoms is being in Havana where the "illness" has been spreading, then all they need to do is not send more employees to Havana, and the risk of symptom spread vanishes. Logical and effective.
And there is precedent; after the mass hysteria outbreak followed by the airing of That One Pokemon Episode in Japan, the particular episode was permanently pulled from circulation, and in 20 years there has not been a repeat incident ever since. Whether the episode actually triggered genuine epileptic seizures in thousands of Japanese children or it simply triggered mass psychogenic illness through no fault of its own, either way the episode was the trigger, and removing it effectively ended the problem.
I haven't been able to find any source that recommends forcing patients or people who are in the immediate pool of potential patients to remain exposed to the environment they believe could be causing the symptoms.
I don't presume anything about why they are staying. Since they aren't tourists but employees of Canada, my guess is that they are staying because Canada wants them to stay.
As I already said, Canada some time ago publicly announced that any employee who wanted to leave Cuba in the wake of the outbreak was free to make such a request and it would be honored. This means de facto that anyone who is still there is there voluntarily.
No, I'm not. But why do you want to watch the Canadian cases isolated from the U.S. American ones that started it all?!
Because Canada's decision regards the health of its own diplomats, not America's.