Why Did the Arrest of Gregory Lee Johnson Violate the First

Why did the arrest of Gregory Lee Johnson violate the First Amendment rights and the arrest of fifty Austin anti-war protesters not violate the First Amendment?

A) The anti-war protesters were violent; Johnson was not.
B) Johnson did not have a microphone but the antiwar protesters did.
C) Johnson did not interfere with the rights of other people whereas the protesters disrupted the lives of others.
D) Austin police officers are better trained than Dallas police officers.
E) There is no difference in the actions; the Supreme Court was arbitrary.