Road rage make fools of us all.
We don't know what happened before the events shown in the video, but it doesn't really matter too much. What we'll see is a motorist flying off the handle and smashing the window of another driver for allegedly driving like a maniac. Now, there is a strong possibility that he was doing just that, but this is not the way to handle the situation. We understand feeling defensive about your kids, but who's going to protect them when you lose it next time and get hauled off to jail for doing something worse?
So here is our little pubic service announcement: If you see someone behaving badly on the road, call the cops. Appointing yourself as enforcer of all traffic laws is also illegal.