The fact that it is not being dealt with is not a logical proof that it is legal. Prove that it is not defamation, harassment, and incitement to riot, and you will prove it legal. Also, bear in mind that I am looking at this through the U.S. legal perspective (as I thought you were), so what is actually being done or not done has no bearing.
I would like you to reread my posts and cite the exact statement that led you to believe that I have a “mistaken notion that one can be arrested for defamation or libel.” And explain how the fact that it is only a civil wrong makes it “protected speech”. I am very confused as to why you keep trying to assert this.