I'm not disagreeing with what you say, but I think it's a stretch to interpret that as a threat.<p>I also think that if a threat is determined to be a misinterpreted joke, then the government should stop wasting time and money investigating it.<p>Suppose someone says something like: 
"The party is really gonna blow up" or "The roof will be on fire!" Are these threats?  What if some paranoid idiot reports one as a threat--should the person that wrote it be fined or prosecuted because it wasted police time?  The authorities repeatedly show themselves to be morons...is it okay to rely on their discretion?<p>These are things I think society needs to start talking about.