Where do the following fit concerning the concept of 'freedom of expression'? 

In a Texas Academy of Science speech last month, Dr. Eric R. Pianka advocated exterminating 90% of the human population via an airborne ebola virus before hundreds of scientists and students.  Pianka's speech was ordered kept off the record and cameras were turned away, because "the public was not ready to hear the information presented..."

In 1990 former KKK Grand Dragon and current leader of WAR ("White Aryan Resistance") Tom Metzger was found liable for inciting Oregon skinheads to murder Mulugeta Seraw in Portland. $12.5 million was awarded to his family.  Metzger is appealing.

In 1946 Julius Streicher, editor of the Nazi newspaper 'Der Stuermer', was convicted by the Nuremberg Tribunal of inciting hatred against German Jews and executed.  So far as is known, he committed no violent act during the Third Reich's hegemony, nor--according to his trial testimony--ever advocated violence in his publication