I'm well aware of the law. I was a full-time flight instructor for years, and the relevant regulation is the first one I taught when introducing students to the regs.

But I'm not talking about whether the captain has final responsibility and authority for the operation of the aircraft.

I'm talking about whether it's sane to escalate directly from something that is very much not an explicit threat of violence, to involving people whose primary tools are suspension of physical liberty and acts of violence.

(Also, please note: that rule says two things. The captain has final authority, yes, but they are also responsible for the choices they make. It's not a free pass to do anything they want for any reason.)