Because the media tells them to be. We don’t even know yet if they cause any problems. It’s a substance that is getting into places it isn’t supposed to be, which *may* be a cause for concern, but the media is in business to rile people up, so they do.
The thing about it is that they’re already *everywhere* so if there ends up being cause for concern, there’s not much we can do about it, so worrying doesn’t help anyone but the advertisers that sponsor the news media.
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