Seems like a really easy argument to make in court-- "so Mr Police Training Officer, how many of your cadets have rule violations during training and qualifications?" "and you still let them carry guns on the street?"
Sounds more like some do-gooder at the club has a thing against 'unsafe' USPSA shooters and thinks throwing them under the bus will help, but the whole point of the rules is to try and stop things from getting truly unsafe well before they do.
Some dude is a serial DQ-er, sure tell them they can't come back to the range if that makes them feel better, but reporting ???