Uncertainty Of Appeal
This is a late response and I know that your ban has expired since then, however I do not see the RDM factor of this, but I do see the FRP factor.
Roleplay was initiated between you and the driver and the other passengers, so this wouldn't be RDM if you shot them, with LFA obviously.
However, it is debatable if it was lawful for you to shoot the driver as they were not an immediate threat in that moment. It would have been appropriate to shoot them if they had hit your person with their vehicle, drew a weapon, or posed an immediate danger to the surrounding civilians, however there was no one nearby and their vehicle was stationary.
I suggest that you open a ticket
here and explain that Joanna directed you there to get another moderator's opinion on the ban and provide them with both of the videos.
Joanna
Moderator
Mountain Interactive