The mil actually removed the term "accident" from the lexicon in most cases for that reason. "Accident" implies Chit Happens, and that tends to culturally dilute personal responsibility for the prevention of accidents (and expectations of accountability).

Accidental Discharge became Negligent Discharge. Except in the very exceptionally rare cases where a modern weapon actually suffers a mechanical failure, but even that is likely to be somebody's fault, just maybe not the operator's.