Seems like this might be a mental health issue, which would be a safety concern for the guys flying. That said the guy probably doesn't want to go to prison over some noise issues. You're probably right, he couldn't really create any issues for you guys and is being prideful about the fact that he is essentially being ignored, which is the best defense against this type of idiot. Maybe suggest to the police that this could possibly be a mental health issue. What type of threats is he making?