I agree with your complaint but I wouldn't use the terminology "fake news". To me, that's more of a specific term that refers to media bias as a propaganda tool. Whereas this is more of a rumor mill going wild as rumor mills naturally tend to do.

But yes, while hoards of people behave in a bit of a crazy manner, it is a known thing, and if you're responsible for public communication, you should understand those quirks and their predictable consequences. And you should realize that an ounce of prevention is worth a pound of cure by just making everything as clear as possible from the beginning.