Don’t legally serious second Amendment supporters regard “arms” as things that can be carried, and are evolved from/analogous to their 18th century hand-carried guns?

It would be hard to classify AI (or tanks, artillery, missiles, aircraft) as “arms” that can be “borne” in that sense.

Is your legal theory that any technology which is dangerous should be protected under the second amendment, simply because it is dangerous?

It certainly falls under 1st amendment protection since LLMs are about accessing speech. But that hasn’t stopped Dario from trying hard to push for regulations and bans that limit our civil rights. He and Sam Altman want regulatory capture at the expense of our right to free speech.