Suburban mom caught up in believing the Family Radio May 21 prophesies tries to kill kids, self, before 'Tribulation' comes. In spite of his right to free speec

Suburban mom caught up in believing the Family Radio May 21 prophesies tries to kill kids, self, before 'Tribulation' comes. In spite of his right to free speech, I can't help but feel the guy behind these theories (Harold Camping) is somehow responsible for promoting this. I realize he has done this before but some people continue to buy into his theories. When it comes to mass media (radio, tv, internet) should we have responsibility rules similar to those applying to yelling fire in a theater?