I don't know what you expected the cam to do, lol. It seems your insurance paid out? If so, how does getting a good picture help at all? The guys a deadbeat with no insurance either way (assuming the apposing driver can be held responsible for damages, not the case in all states).
Assuming you have fault based accidents and can sue for the full cost, again the guys a deadbeat. I don't think this is the money saving idea that it seems. I'm not sure what you're hoping to accomplish, honestly.
> Long story short, even if you have a dash cam, sometimes you're SOL
Quite simple: Explain how you would have benefited at all, or why you were SOL. It sounds like the outcome could not have been improved... I guess maybe you think that there's a better chance of the person getting caught.
Are you just sad they weren't able to put someone in a cage, even though there's no financial impact on you whatsoever.