A scientist, like any person, can say anything they want. You shouldn't believe something a scientist says just because they say it. They have opinions and can be wrong just like everyone can. I'm sure some scientists say ghosts exist and others say they don't.
Science, on the other hand, can find no evidence of ghosts. That doesn't mean they don't exist, however. Science makes no statement one way or the other on the subject of ghosts. They have never been observed, as far as we know, but could still exist.
Where do you get this "end of the world" thing? As for the claim of "alarmism", do you not remember the flu strain several years ago that tended to kill healthy people in the prime of their life, rather than "immunocompromised hosts"?
It's not that the reports are "alarmist". It's (1) you're not understanding the actual risk, and (2) you're pretending that the reports are predicting the end of the world.