Earlier quoted context omitted.
Negligence is negligence but people tend to view vehicle collisions as "accidents", as in random occurrences dealt by the hand of fate completely outside of anyone's control. As such, there is a chronic failure to charge motorists with negligence, even when they have killed someone. If you end up in court, just ask for a jury and you'll be okay. I'm pretty sure this guy didnt even go to court, sounds like it got pros…
That sounds like the justice system living up to its ideals. If the 12 jurors know they would have done the same in your situation, as would their family and friends, then they can't in good conscience convict you for negligence.
It's just a variation of letting off the defendant that looks like your kid, or brutalizing someone whose victim looks like your kid, it's no ideal of justice.