Denied.
After reviewing the full context of this appeal, including your responses, the original request, and the relevant IC events, I'm denying this appeal. The PK was valid, justified, and executed with sufficient cause based on your character's conduct.
Let's be absolutely clear, this PK was not issued solely because of the trial or PCO denials. That situation was handled with a demotion, a fine and time in jail. But facing consequences in court does not grant you immunity from further IC retaliation, especially when your actions after that trial continued to escalate against the NSB. The NSB, more than any other faction will persue further action against you, legal or illegal.
If your behavior towards the NSB then continues to pose a threat after the trial. Then you are certainly not protected by that trial, you were warned by it. If anything, the court outcome placed your character under increased scrutiny. What followed was repeated defiance, intelligence gathering on the NSB, obstruction and ultimately fleeing NSB custody during a military led breach this fully justified an IC response from the NSB beyond any legal proceedings. At that point it becomes entirely reasonable for the NSB to want to murder your character.
You don't get to provoke the NSB repeatedly, get broken out of their custody by armed members of the military and then argue you should still be safe because you complied "eventually". Your decision to leave with them, regardless of intent is what made this PK justifiable along with your other actions.
On top of that, there was an active case file detailing your conduct, including your internal statements referring to the NSB as kidnappers and criminals. That's not going to be taken lightly that's seen as a declarion of hositilty against the NSB, and it further supports the justification that your character had entered open opposition against the NSB.