Your reasoning is not valid, and even if it was valid you still didn't give enough time to react and let the rp escalate for no reason, you could have handled it completely different and without just killing as you saw you even killed the guy you were trying to save, with that I don't think your ban is unjustified. Also, you were involved in a situation before you were in MOI because you and your friend were killed for punching me for no reason. After that your friend decided to come back and he was arrested for carrying a MP 40, but since I saw the logs that you changed your character after that happened and you came to MOI, so this is metagaming again, I think your ban should be extended because you lied multiple times in that appeal and also did more than just RDM.
I would suggest that you read the rules again, or perhaps for the first time here.
Yours sincerely
Mr_Arrovv