Whats the definition of a flyby? If the guy in question did it at 30 feet then yes hes an idiot.. but if he did it at 500-1000 feet then its not unsafe. Everybody has done a flyby of sorts in their careers and this not the sole domein of som armed force trained nigel
What is a missed approach or balked landing if not a flyby? "trained to do flybys.." good grief.. It must have been a miracle that I survived flying down the grass strip before landing on it with the kingair..(Checking for field-mice and such..)
Without knowing the details or seeing it myself I reserve any opnion whether or not he was unsafe.