Our government has a long history of testing experimental weapons on its own personnel, such as the MK Ultra Project and Operation Top Hat. I wouldn't put it past one of our military or intelligence agencies to do this.
https://en.wikipedia.org/wiki/Unethical_human_experimentatio...
Something all those spooks were doing in their diplomatic posts is the cause of Havana Syndrome. But the Government will hide any evidence they have, so that there won't be millions or even billions of dollars in Workplace Injury Compensation claims.
I think therein lies part of the problem: it has to either be caused by secret weapons, or mass hysteria. The same kind of outdated thinking is what has caused the dualistic thinking that we see in ME/CFS and longcovid.
It is also surfacing that a lot of Historical Mass-Histeria episodes were linked to phisical causes such as hallucinogen contaminated bread, instead to the Devil for the ancients or Self-delusions for the Modern people
>One agency, which the officials did not name, determined that it was “unlikely” that a foreign actor was at fault, a slightly less emphatic finding that did not appreciably change the consensus. One agency abstained …