"Anyone who deliberately flies overweight is a liability."
Unless the circumstances warrant it.
Worked with several ex-Rhodesian Air Force Alouette/Huey pilots in the early 1980s. They had 'occasionally' operated the Aloe's above MAUM until the manufacturer's test pilot told them that - of all the limits they could exceed - going over max mass was the one thing that would prematurely b*gg*r the aircraft. They went to great lengths after that to keep below the limit, as resources weren't exactly easy to come by.