Basically I agree with you but the family might have felt that no jail time would diminish the value of the little girl.
Obviously he had several lessons that needed to be learned. Illegally firing at deer over salt licks, not knowing his backstop . . . And his shooting days should be legally over. But he sounds like someone who really isn’t going to do it again, really would stay away from guns if that was part of his sentence, and really would try to compensate the victim’s family monetarily. He just doesn’t strike me as a good use for a scarce and expensive prison cell.