How does one "negligently" shoot someone that they intended to shoot?
Woody summed it up very well. I know someone who was the subject of an unprovoked carjacking attempt. The detectives and DA agreed that it was a justified shoot. He even got his gun back.
So, he was left to deal with the nightmares.
Until about six months later, when the "victim's" family decided to bring a wrongful death suit on the grounds of negligence. Bear in mind, this was in a state with a "stand your ground" law.
Fortunately, he was able to tell the judge that negligence was not a factor, since he did in fact mean to shoot his aggressor, and the whole thing was thrown out.
Nonetheless, that was his time, stress, and money on top of all the other issues he was working through.