I think misdirecting people to create a panic is illegal no matter what. One should always be liable for the consequences of their actions.
The line gets s lot blurrier when you call fo arson and someone acts on it and burns down a building. Should you be liable for the actions of the third party that burnt down the building? Imho there's some responsibility to be held, yes, despite you only calling for it.
But I wouldn't want anybody to wield the power to legally shut down other people. The amount of abuse that can generate in the wrong hands is Tremendous (see what I did there?)