There's no convincing here that this is a mistake, the wanted player was getting arrested by the cops, meaning obviously they were all standing next to each other. This must be one hell of a rocket science to try and save the wanted by diving head on with a chopper with enormous blades killing only the cops and leaving the wanted alive.
It obviously wouldn't have been a problem if the player was a most wanted or has recently posed a threat to you, but that was just RDM without a doubt, therefore Trevor's infraction is valid. Closed.