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Is whether wishing someone to die is lunatic, or fringe, or the glory of the first amendment.
The issue is what the hell do you want to do about it? Send the secret service around trying to track down the anonymous posts and see if that person is mail ordering a rifle and getting a job at the school book depository? Hannity, among others, have already expressed support for this strategy.
That sounds like almost as good an expenditure of resources as the invasion of Iraq. Almost, but not quite.