this pretty much sums it up.
Alright, sure.
"Shouting fire in a crowded theater" is a popular metaphor for speech or actions made for the principal purpose of creating unnecessary panic. The phrase is a paraphrasing of Oliver Wendell Holmes, Jr.'s opinion in the United States Supreme Court case Schenck v. United States in 1919, which held that the defendant's speech in opposition to the draft during World War I was not protected free speech under the First Amendment of the United States Constitution.
I'm not sure you can reasonably say that he did this with the goal of inciting panic. (I'm pretty sure that's why he was released in the end.) It wasn't as if he intentionally went in public and screamed "I'm going to go shoot up an elementary school and eat the heart of a child!". It was said online, in the context of an argument with another person where, obviously, emotions are running high and people are getting angry.
People have indeed falsely shouted "Fire!" in crowded public venues and caused panics on numerous occasions, such as at the Royal Surrey Gardens Music Hall of London in 1856, in Harlem in 1884,[1] and in the Italian Hall disaster of 1913, which left 73 dead. In the Shiloh Baptist Church disaster of 1902, over 100 people died when "fight" was misheard as "fire" in a crowded church causing a panic and stampede.
Except from what I can tell, not a single person was harmed besides the kid who said that stuff. I'd understand if there was anything indicating that he actually went out of his way to freak people out instead of it being a result of him being in a poor situation.
A false alarm, also called a nuisance alarm, is the deceptive or erroneous report of an emergency, causing unnecessary panic and/or bringing resources (such as emergency services) to a place where they are not needed. False alarms may occur with residential burglary alarms, smoke detectors, industrial alarms, and in signal detection theory. False alarms have the potential to divert emergency responders away from legitimate emergencies, which could ultimately lead to loss of life. In some cases, repeated false alarms in a certain area may cause occupants to develop alarm fatigue and to start ignoring most alarms, knowing that each time it will probably be false. The concept of this can be traced at least as far back as Aesop's story of The Boy Who Cried Wolf, where many episodes of a boy falsely yelling "wolf" caused the townspeople to ignore his cries when a real wolf came.
I honestly think you're going out of your way to assume that there was any real intent behind this, which is absolutely key. I think deciphering intent would simply come down to a difference in experience and worldview, however.
Even if it is humorous, it is still a legitimate threat, and much be addressed as such.
Now this is where I start to get worried. At what point do we draw the line between something being a joke and something being an honest-to-goodness threat? Looking at his comment, I wouldn't be surprised if I've said something foolish like that out of sarcasm or while being stuck in an argument at some point in time, but I don't think I've ever had the desire, means, or capabilities to ever do any such action for as long as I've lived. I wouldn't be surprised if everyone in this thread said something like that at some point in time during all of their years on the internet as well. I mean, sure, you want people to be careful and not let actual things get past, but context and such should still definitely be considered before you throw people behind bars, lest you risk ruining an innocent life.
I believe that if you incite false panic and a life is lost either due to the panic, or because they were not treated due to your panic, you can be held responsible.
This is kind of like the whole "Swatting" thing that went around, which is now considered a felony.
Thing is, I don't remember anything about any lives being lost due to this panic, and nothing I've found has indicated that any harm occurred to anyone, as I said before.