I was the staff member with the banning admin on that certain situation.
I would also like to add that your ban was justified as what Rem has stated from the actual Diverge Networks Guidelines.
"If you are a corrupt cop/government, it does not give you justification to RDM other members of the police/government ."
"Abuse of Power/Guns/Arrests will result in removal from your job and possibly a ban."
You violated Fear RP two times, as well after technically being PK'd by Law Enforcement, you decided to go for a 2nd run and grab another shotgun and go on a spree again, which resulted you being shot again on the 2nd floor of the Precinct. You had the intent to kill more people for no reason which is a clear violation of our guidelines. You also stated that you wanted to get fired, so you pulled this stunt with your "friend" however that does not mean you can shoot up the PD without Gamemaster approval, as well to violate every rule that was stated in our responses. If I recall you have at least one month playtime on the server itself and even tried to apply for staff, which means you would had to familiarize yourself with our rules which means you knew what you did was wrong.
Good Luck.