Points of principle costs money I'm afraid.
Put yourself in the place of the insurance company: if it costs, say, �1,000 to repair a car and leave it at that or �1,000 to repair the car and then �25,000 in legal costs to pursue the other party, without any guarantee of success - espeially in a case such as this one where it is one word against another with no independent witnesses - what would you do?
I know damn well what I'd do.
Accidents are emotive issues, as you have proven by going to an ambulance chaser in the past, but sometimes it is better to take a step back and look at it as objectively and pragmatically as possible. I know it is frustrating, I've been there.
Also, if insurance companies pursued every single lost cause you and I and everybody else who buys insurance in this country wouldn't be paying hundreds for our insurance, we'd be paying thousands.
It is the common pool principle.
What would you prefer?