IMO there are at least two types of accidental discharges.
User caused accidental discharges and gun malfunction accidental discharges.
Both qualify as a accidental discharge.
I disagree. I would say there are gun malfunctions that produce an unintentional (accidental) discharge, and then there are negligent discharges that are caused by improper or careless use of the firearm. I don't consider them two flavors of ice cream. I consider them entirely separate phenomena which share only a symptom.