I banned you because you were sat on top of a roof shooting down on civilians without making any attempts of arrest but you didn't do this once but twice, not to mention you were in plain clothes and had no badge on. You have been banned a plethora of times for RDM on your cop character and should be grateful you didn't receive a longer punishment. You mentioned the reason behind shooting these people was because "Shooting people because their friends are being punched isn't the correct use of force" which is ironic because don't you think executing a player without making an attempt of arrest would also not be the correct use of force? You've been playing for half a decade and have yet to fully grasp the rules, so I believe I was more than fair with my ruling. Have a good day.
You requested a second opinion which I got from Byte, I told you to DM him for confirmation.