Sounds almost like a bipolar episode, but it could be just run of the mill nutjobbery.
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The article says that the perp told the police he had been smoking “purple hash”, whatever that is.
Sounds like deer scat after they've been in the blueberries or blackberries. Smoking that crap will make you crazy.
Here at FR, if someone doesn't know what something is, someone will take it upon themselves to educate you. Today, I am that 'someone".
From the website "Leafly.com" ("the world's largest cannabis strain resource"), purple hash is desecribed thusly:
"Purple Hashplant is a hybrid cannabis strain that provides well-balanced head and body effects along with great flavor. These diligent plants are easy to grow and should be ready with their bouquet of perfumed flowers within 8 to 9 weeks. Buds will have a purple taste that their color hints at, full of dark fruit and berry notes. Purple Hashplant produces euphoric effects that are great for relaxing or clearing the mind."
And now you know.