>here is someone who threatening them.

Threatening them, who is them? As deplorable as his speech was, it was not an identifiable threat of some imminent danger to some specific victim. (ie. I would have a different opinion if he identified a school by name). A counter-argument to my opinion is that we could have people making very real, but vague threats and police could not take action until after it is to late. However, there must be a balance between right to free speech and police powers, I just tend to err on the side of rights over government power.

>If someone came up to me on the street and screamed I'm going to fucking kill you, I wouldn't argue for his freedom of speech.

Your example is good because it can highlights where the law can strike a fair balance better rights and powers. First, I agree in your example I would not argue for right to free speech, but the declarant in the story is more akin to someone on the street screaming "I want to fucking kill someone" not directed at anyone and otherwise not posing an immanent threat.

If this kind of speech is to be punished with 8 years prison or 10 years probation, police just need to log onto Xbox Live and have a field day with all the threats...in fact one of the statements from the thread in this story "go drink bleach", I have only heard before on Xbox Live and I have heard it many times from various players - though this example is not a threat there are plenty to be found...mostly involving mothers.