I have to admit that I don't pay much attention to the news anymore. So I guess I honestly couldn't say. Occasionally I'll catch a local TV news program. I recall, a while back, there was a story about a "catch phrase" that made the rounds of TV sports reporters. The phrase was something to the effect: "boom goes the dynamite." Apparently some reporter, somewhere used this phrase. Almost overnight, nearly every TV sports reporter was saying: "boom goes the dynamite" any time there was some big play!
I think this is indicative of what happens.
Reporters are just like a bunch of chimpanzees: monkey-see, monkey-do. They copy each other. In the example above, it's just silliness. But of course when it comes to attributing every terrible thing that occurs to mental illness, this can have tragic consequences. Unfortunately there is no line. These news media types pretty-much just keep grinding out the same old gruel. About the only thing that can be done, I think, is for everyone who is concerned to challenge these questionable attributions whenever & wherever they crop up. Perhaps what we need is a mental health "truth squad"