Isn't this a "fire in a theater" event pretty much outside the 1st amendment protections. Newsweek deserves what it's gonna get!
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.