The more I think about this I do not think there is any clear distinction based upon prior rulings of public speech in criminal court as to whether or not the WBC had their free speech violated.
The "fighting words" doctrine still exists. That case that brought the determination of fighting words as unprotected speech pales in comparison to the reaction of the WBC's actions. That case was about a Jehovah's Witness distributing religious literature found offensive by many individuals who filed a complaint. He was charged, convicted and the conviction upheld. It was a criminal case.
Chaplinsky v. New Hampshire (1942)
Many decisions by the courts, even the Supremes, have not provided a clear clarification nor overruled the Chaplinsky decision.
Even though the above is about criminal law it is those laws and the Supreme Court's decisions reviewing those laws which will determine the extent of the first amendment.
The flag burning decisions have come down on the idea of
political speech. Such speech is probably guaranteed protection under the first amendment under most interpretations.
But none of this is civil law. That is what disturbs me about this case. If the church, however reprehensible they may be, were not violating any zoning issues or criminal conduct then the civil lawsuit is unnecessary. It may also be considered a religious/political action that may lead to a claim of civil rights violations on the part of the WBC.
In other words, the wisdom was given long ago that ignoring this group rather than the continued media and court presence is better.
Playing with a can of worms.