The Supreme Court ruled in Gertz v. Robert Welch, Inc. that defamation is not protected speech, and the Supreme Court's word is final and absolute. No amendment is needed, as the Supreme Court has consistently ruled multiple times that freedom of speech is not absolute. Your arguments are the same kind of logic used by tax protesters who concoct arcane reasons that they don't have to pay income tax yet invariably find themselves convicted for tax evasion.

Fraud has been illegal for as long as the US has existed. It's not protected. If it was protected as free speech, fraud laws would have been overturned sometime in the last 225 years.

Further reading:

https://en.wikipedia.org/wiki/False_statements_of_fact

https://en.wikipedia.org/wiki/United_States_free_speech_exce...