I have been asking this question since the video first appeared (and I saw the FULL LENGTH VIDEO, not this EDITED VERSION).
WHO and what was their MOTIVE?????
No one seems to care about that issue.
Found another AP story that says the driver posted it. Then, after posting it, he announced he was going to sue. Busily working to taint the jury pool, I suppose. He has a trial on the speeding ticket in January, maybe he's hoping to make a trade.