Think this through... What's going to happen (at least in the states) once the accident scene clears, tickets are issued, and everyone is on their way? The innocent guy with the ticket has to take time off of work to go to court. Assuming his video evidence is admitted (there may be evidentiary objections by the court), and you have an open-minded judge/magistrate, the BEST results are that that the ticket is dismissed. The ACTUAL guilty party will not suddenly be charged with causing the accident. It'll simply be a no-fault, or equal-fault finding by the insurance company.
Hopefully the cammer's insurance company will subrogate the claim with the truly at-fault driver's insurance. But that happens behind the scenes, and the cammer has no way to make sure this happens.
As I see it (and perhaps I'm wrong), the ONLY way to make sure the proper person is ticketed is AT THE MOMENT THE CITATIONS ARE ISSUED. While you can fight YOUR ticket in court at a later date, it will not do anything to make sure the responsible person is held accountable.
Edited to add: What are the chances the cop, who so was so clearly derelict at doing his job, will see any consequence for this - let alone even be told how wrong he was? Without accountability (i.e. real consequences for doing a piss-poor job), there will be no incentive to do their job the RIGHT way. In any other profession, you screw up this bad, you're canned, sued, or at least reprimanded.