A negligent discharge is caused by either ignorance or carelessness. The person can be considered ignorant, if they have not been trained. They are careless, if they disregard their training.
Always keep your finger off the trigger until ready to shoot Always keep the gun unloaded until ready to useThere is no such thing as an accidental discharge.
Always keep the gun pointed in a safe direction
Arrogance breeds idiocy.
Once upon a time I had a Taurus .22 LR pistol with a tip barrel that was a knockoff of a Berretta.
While at the range it began double firing.
Fortunately I was observing the rules, treating it as loaded, , pointing it only at the target, ensuring my target and behind.
The gun malfunctioned and fired twice per pull on the trigger.
Accidental, yes.
Negligent, no.