But if war were declared, and self-styled "peaceful Muslims" were actually making claims such as this individual, what legal threshold would have to be crossed for arrest for "sedition" to occur?
I do not know with any certainty, but I bet there are some lawyers who frequent FR that do know.
I think we ought to take advatage of this time to review all aliens' status and deport or inprison any illegals.
During a period of war I would be fine with giving people who made public statments like the above the choice of prison or exile even if they are citizens.