So because you assisted with his medical treatment that gives you the right shoot him because he is catatonic (AFK)
You are a supposed to be a member of the police who helps people as you said yourself and you don't get to just decide to shoot someone with lethal ammunition, which btw was done as a drive by....
IMO you should be removed from the police but that is not my decision, however i am here make sure people follow the rules and the rules are clear.
6.1 RDM is when someone kills another without any form of roleplay, ie someone shoots someone without a single word said.
1-day ban - non-appealable (minor offence)