"that all hunters are trained from day one to act in a certain manner that prevents these very things from happening"

HUnters are not God. Most hunters are not trained, they grow into it and learn by example. They are human too.

"one of those proscriptions is know where your companions are at all times and be absolutely certain the field of fire is clear.
If it could be proven that he was negligent in following these rules he would be a candidate for a lawsuit at the least.
Experienced hunters don't have "accidents". "
I disagree. THe same argument can extend to saying that experienced drivers don;t have accidents, and the truth is, they do. That's why they call them accidents.

-akhilesh