What is happening here is the same thing that happens with UFO's. There are multiple incidents for which there is no good explanation, and many people automatically assume that they have the same cause.
Just a few remarks.
The incidents occurred in foreign countries. These countries may have diseases to which US citizens have not been exposed.
The persons involved were mainly CIA. They are payed to be paranoid, but sometimes paranoid people are wrong.
What is the motive and who is the perpetrator? Russia is the obvious candidate, but why would they do it with some weird kind of radiation. They are perfectly capable of killing people with chemicals.