I had agreed when I read your comment before I read the article. But after reading the article it feels like this is missing the mark. We're bumping up against the equivalent of gang stalking / stochastic terrorism here - someone being harassed through digital channels and put in a mental state where they're fearing for their life in the physical world.
A similar case of the phenomenon happened in NY a while back [0] with someone being killed for driving up to the wrong house at night, with the shooter presumably having been pumped full of general fearmongering by mass media. But the stark difference in that case it was the shooter's own media diet creating insular paranoia whereas here it was personally-targeted digital communications making the shooter feel threatened by the person ostensibly acting as an agent of those threatening him.
This is a tragic situation for sure, but falling back to applying fundamentalist judgement to emergent behavior is a mistake.