>A warning, whether mistaken or not, is not a death threat, and a death threat is not just a complaint.

I don't think there is exactly the same crime in all the states of the US, but there is in some states (as well as in many other countries) the crime of "false public alarm".

Example, you start crying "Fire!" in a crowded cinema or public place:

http://mollolawfirm.com/resources/criminal-law-resources/fal...

P.S.: Meantime in Japan:

https://www.washingtonpost.com/world/asia_pacific/first-hawa...

but this was not the governemnet, it was the NHK and they were very fast to send a correct message.