Agreed. He may very well have cost someone their life with that stupid act. Maybe not today, maybe not tomorrow, next week, or even next month. But at some point someone who witnessed that gutless act or saw it on social media is going to run into a situation where they have to comply with LE. Only thanks to ball-less here they're going to think their s**t doesn't stink and they can get what they want by being an obnoxious a-hole. They are going to get shot, or run over.
The best response is not to give in and embolden these fools. We should be showing controlled but forceful responses that send the message loud and clear: make all the noise you want, but in the end you will lose. This only ends one of two ways. You walk away, or you get carried away. There should be absolutely no bluffing, no backing down in the face of a mob.