Denied.
The PK guideline you fell under was "Being killed while not abiding by Fear-RP".
In the clip provided you were given so many chances to stop and comply with the players who had you under fear RP.
You decided to not comply while under fear RP and even asked to be shot as you thought that would get you out of that situation.
Then you pulled your gun out while you were under fear RP and died.
Also to answer your question there is no rules on who can arrest people and who cant arrest people anybody regardless of their faction / job can arrest someone.