I have not checked the detail of the Guam spree killer case and cannot conclude it, though it was highly likely that the perpetrator was manipulated by the CIA with this electromagnetic wave capability.
The agency has had a capability to brainwash a target covertly with the electromagnetic wave and they have a subject hear the voice remotely like the case in Guam. He assumed it was a voice of the god, though it depends on the individuality; some others might perceive they suffer from the schizophrenia.
There is a possibility that some others might realize it is a result of the synchronization that their brain is affected by the electromagnetic wave from the outside. You can understand how it works technologically if reading my writing so that this realization is more often than before.
We are still manipulated by the outside wave, even if realizing the electromagnetic wave technology is availed against ourselves. However, if not noticed, you might be brainwashed to commit a crime, including a felony. Some of us have a tendency to conduct a battery just when our aggressive emotion was enhanced and this type of the manipulated crimes have occurred more often than you assume.
The CIA was capable of deploying this technology in Guam, which was used in November 2009 against me. The Guam spree killer case occurred in February 2013, hence the agency had already deployed it there.
I saw some individuals who were capable of assassinating the target in Guam as I was one of the targets, which meant that the CIA had a team for the black job out there. I assumed this team was availed for this spree killer case, though it was quite hard to prove this technology was used in the law court.
If there were several confessions and recordings of the real manipulation, we could have confirmed it, though that was highly likely not the case.
As written before, I saw the same type of operation that the old man committed a suicide jump quite next to my hotel on 12 February 2013, actually one hour before the attack in Gaum. This was also the day that one of the local police chief, Masatoshi Yamazaki, was assigned to a local police chief, who was in charge of the operation against me employing a full length of the local police organization. All of them were linked, implying that the Guam spree killer case was highly likely manipulated by the CIA to kill many Japanese.