Hello, banning admin here. While you may have been flipped over by this person, it was not until after you chased him down for bumping into your truck. When the police chase between the Hummer and PD ensued, you followed him. The Hummer gets away from PD, and you're still chasing him. You find him, and attempt to stop his truck (while he is still on the run from PD). He, acting in self defense, pushes your car over so that you will stop. Road rage is where this originated from, over one single hit. As pointed out by yourself,
You may not kill someone for hitting your vehicle with theirs, light bumps/small accidents are normal and can happen. However you may kill them if they continue to target your vehicle with theirs or ram you multiple times, intentionally attempting to swerve and hit you/your vehicle.
After the wreck you chased him, not the other way around. At around the 30 second mark we hear you allude to this in your clip "Gotcha that time". At the beginning of the clip we see you attempt to block him in. The evidence I was shown combined with this makes me believe this ban was fair, but good luck on your appeal.