I beg your pardon.
You wrote: “And what evidence is there that all of this is anything other than coincidence? The whole story seems contrived.” Not I.
I do not believe in coincidence despite being open minded about most things. Meaningful or meaningless coincidence.
I wasn’t trying to defend or offend Jung.
Back to my probably correct guess: The Communist Chinese abducted them and tortured them (and used mind drugs and paralytics on them) to extract important scientific secrets to use against America.
Frankly, your ‘guess’ seems like some fiction-inspired fevered dream to me.
Let me know when you have any proof of it.