We have a fellow that wrecks alot of planes too. His problem is medical, the result of a stroke from years ago. The guys at the field buddy box with him which helps, but his stuff still gets broken from the instructor not catching a mistake quick enough or from repairs that don't hold up or bad servos. He hasn't been dangerous ever that I know of though. I think after an unexplained crash into the parking lot some restrictions are in order for your friend. He is violating the AMA safety code which your club has agreed to enforce if it's an AMA sanctioned club. Perhaps he needs to spend a season on the buddy box until an instructor believes he is in control well enough to be safe?