Good question. What allegations, true or false, will incide some observers to violence, or otherwise create a foreseeable risk of injury (like a "Fire!" report does).
At least two of the above are adequate justification for violence or foreseeably puts people at risk of injury? And anybody who falsely utters one of those things ought to be punished?
"Fire in a theatre," I doubt it. Sloppy, mean-spirited reporting, to be sure.
I guess that would force me to ask how many free shots Newsweek should be allowed, then, in the interests of selling magazines. There can't be any argument that such a story containing elements of religious disrespect, or take your pick, Arabic personal insults, insults to a prisoner's family tree and so on, would set someone in the middle east off. Just a few minutes ago I heard an update wherein a Newsweekgeek was denying there was "an agenda." Those people can't be stupid enough to think that story, true or not, wouldn't have a consequence. That all leads me to conclude that we're just watching another inbred member of the MSM commit SUUEESIIDE (remember Lantos?)