No one is claiming they don’t have the right to throw verbal bombs, lie, or waive the traitors’ flag. But all their actions and words are subject to scrutiny and verification.
My point remains that actual historical events taken in sequence make a hash of their retreat to the “Founders’ original intent”. The first salient point is the inclusion in the original Constitution of amendment processes. There goes any meaningful claim that the original document is “sacred” or “unchanging”. The 11th Amendment (sovereign immunity) and the 12th Amendment (changing how POTUS & VPOTUS are elected) acknowledge the antebellum acceptance and utility of the amendment processes.
Then the Civil War was fought. The version of the Constitution claimed to protect States’ rights, to authorize secession, to limit federal government, and that institutionalized Slavery was re-made when the 13th, 14th, and 15th Amendments were ratified.
Bingham’s floor speech about the intent of the 14th Amendment, i.e., to rein in the States and to assert federal protection over U.S. citizens’, forecloses any rational person from resurrecting claims that the federal government has no role to play when state governments are depriving citizens of privileges and immunities such as due process, equal protection, and adequate education.
Your point about the failure of the Corwin Amendment just reinforces my argument about the originalists’ irrational and ahistorical arguments.