On March 1st of this year my brother was at the house waiting for me to get home from work so he could pick up his registration renewal, which I had gotten for him. He had a spare key to one of my cars. A guy driving a vehicle pulling a trailer arrived in the area to pickup a bed from somewhere in the neighborhood, and my brother was going to move the car so the guy could park. While attempting to get into the car, the guy flipped out for some reason, whether because of a misinterpretation of words or something else, and intentionally hit the drivers side door of my vehicle with his trailer, injuring my brothers neck and causing $1,000-$2,000 in damage to the vehicle. He sped off, not even stopping for the stop sign, and went home where he proceeded to unhook the trailer and attempt to make it look like it hadn't been moved by parking other vehicles in front of it.
My brother managed to get this guys plate number and called the police, who quickly located the guy, his vehicle, and the trailer. My brother and I went over with the police and he positively identified the vehicle, trailer, and the guy driving. The man was charged with 3 things: Leaving the scene of an accident that resulted in personal injury or death, Driving on a suspended or revoked license, and Failure to report an accident. He has since plead guilty to all of these charges. In March, my insurance company (Progressive) found my brother 100% not liable after investigating. Today, I received a letter from this guys insurance company (American Family) that states the following:
Our investigation has been completed and it has been determined this would not be considered an accident under out insureds auto policy.
We must deny your liability claim.
How can this not be considered an accident? Is there anything that I can do to have this decision overturned? Is there any legal action I can initiate against this insurance company? Since the person who committed this crime admitted guilty to all of the charges, why would my claim be denied?
Thanks for your help!

