Correct. Once the airline calls law enforcement to deal with you, let it be CPD or Aviation Security, the airline steps back and LEOs aren't there to determine right or wrong...they just deal with the situation at hand.  Pilots and crew are in command of that aircraft... if you want to want to make a federal offense by disregarding crew instructions no matter how benign it might be, then you damn well better be prepared for the consequences...including getting tased or dragged off the aircraft if need be.