I don't see that the Sheriff was arrested for defending anybody's 2A rights. Per the arrest warrant affidavit he took a public record and said document has not been seen since. The affidavif speculates that the document was then destroyed.
That the Sheriff believed that Parrish should not have been arrested, or that the law is a bad one that he prefer not be enforced in his jurisdiction, are subordinate to the fact that he took a public document and possibly (probably) then destroyed it. That is not any of the methods recognized as legal/lawful for stopping/preventing the arrest of persons suspected of violating the law the Sheriff believes violates the rights of citizens. You know, like seeking an injunction, or starting up a campaign to have the law repealed.
Even if one supports the Sheriff's position that the law in question should not be enforced because it does violate rights guaranteed under 2A or violates other laws, there should be no support for him removing (and possibly destroying) a public record. Not even if he removed (and possibly destroyed) the public records relating to every single person ever arrested on a charge of violating the law about needing/carrying a license in order to carry a handgun.
stay safe.