Wonder if Homeland Security ought to be aware of this kind of talk?
I think that it is something that should be looked into.
Honestly, I'm more into messing with their heads. Start posting cryptic comments about hearing rumors of "an Argentine solution", of "task forces to deal with domestic terrorist supporters", perhaps of "organized citizens groups" trained by former CIA and Latin American intel (re: "death squards"). Post paranoid information about nonexistent phone taps, visits by shadowy figures and the like.
Really drive them insane and break their will. These people are mentally disturbed cowards, incapable of anything but typing.