"Where does one draw the line"
Across the line is called slander. Also, a person can be held liable if their speech causes harm or death.
IE: A person announces in a theater the tornado siren is just being tested. No need to seek shelter. Then the tornado destroys the building, although there was shelter nearby and plenty of time for them to have gotten there. The announcer, and his employer, if told to say it, can be liable for all injuries.
Anything you say or print can bring on consequences.