Yes, rule of law is a powerful thing. The dashcam driver will be fully vindicated when they end up in the court of law and the evidence gets presented.
Here's the reddit discussion on this incident, interesting stuff:
this really stinks, because you have no fault at all but have to waste time and efforts to fight the ridiculous ticket not mentioning the insurance inconveniences caused by the other reckless driver.
this morning another reckless driver almost swayed his car into my lane and scratched my car