https://www.youtube.com/watch?v=9mnywjPPDtU
Note the people flying through the air before the car becomes visible. Note the people flying through the air and striking the car in front of him. Note the people being thrown to the ground.
Note: NO BRAKE LIGHTS.
If anything, it exonerates him on any charges he faces resulting from the injuries he caused AFTER he started moving in reverse. Anyone running up behind a car that has already driven into a crowd, and who doesn't understand what it means when the brake light has been activated and then turns off and the reverse light illuminates, is an 'effing moron.