Accidental or Negligent?

An important distinction:

. . . an accidental discharge is when lightning strikes your firearm in such a way as to cause it to fire. Just about anything else is a negligent discharge.

Any unintentional discharge of a firearm can usually be traced to negligence on some individual’s part. Not knowing the proper manual of arms for a certain gun. Not focusing on safety while handling it. Using the wrong ammunition. Failing to properly maintain a particular firearm. Leaving a firearm laying around where some unauthorized person might pick it up. And you can think of other examples of negligence that could lead to a discharge that often results in injury or death. Using the term “accident” sort of implies that it was really nobody’s fault, while “negligent” puts it right back on somebody who should have been more responsible.

Which 'somebody' might the author have in mind?