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Shooter, you do realize, that by your logic, the cops would have to raid all those fundie Christian groups who advocate Armageddon and the end of the world. So is your suggestion to raid all their churches, seize all their property and charge them with conspiracy?
Apparently you did not bother to read the link that Glen posted. Whether you want to believe it or not just "advocating violence" is not reason enough to be arrested. Just because you want to believe something is true, doesn't necessarily mean that it is true. In this case you happen to be dead wrong.