Hi! PKing admin here. I understand you're new to the server and that this may feel harsher because of it, but this PK has been applied in the same standard that the staff team consistently uses. You may disagree with the haste the officer used when moving to arrest, but that would be an IC issue to be argued ICly. Instead, you chose to open fire on the officer. This is a fair course of action, but, as I explained in the sit, it is one that has its consequences for failing.
To prevent everyone from escalating to violence against a police officer willy-nilly, there is real consequence to it, that being the potential permanent death of your character. You and your friend opened fire on a cop, which brought the risk of dying when the officer returned fire.
TLDR; you and friend shoot cop, cop shoot back, you and friend die. This is the risk you took in opening fire on the officer and you missed your shots. Had the officer opened fire first or unjustly escalated the situation to violence, this would be a different result. However, you were the one to escalate.