Mike I didn't ask for a near-rant about your anarchist views, I asked a single-sentence question.
Yes, but the only answer I can give is that one. The fact is that there is no such thing as "legitimate authority", especially in an RP like this, where the rule of law is weak at best and we are all playing characters who the normal legal processes simply cannot touch. Axe Cop literally just said "I'm here and I'm a Cop, so I'm taking over the police force", and no-one bothered to argue because he's powerful enough to do it.
There is no other answer I can give because, frankly, you are
right, not in terms of Gil or Karna being immune, but in terms of Axe Cop having absolutely zero actual authority as a police officer (unless someone officially appointed him as a Nexus police officer behind the scenes, anyway). But, no-one really cares about that because he's too damn useful, and too powerful to stop. He just enforces the law of the Nexus because
he wants to.
The fact is that authority has
always existed through force. Karna didn't end up with power because he had legitimacy, he ended up with power because he defeated and often killed anyone who said he didn't.