Military cryptography experiment?
I wonder if the whole thing was an experiment to find cryptologists? It's the kind of thing the CIA was doing in San Francisco at the time so it might have been a CIA operation. Most serial killers are produced by the US military so it makes sense that they would want to experiment in the area of getting away with mass murders in america as well as in south eat Asia.
It was probably all a government experiment. Like the Boston Bombing to see how scared they could make people and how much control you could have over them.
She has a kind of psychiatric cabaret. Very good. There was something about Suez.