If your driving in that situation had caused the death of another person the cop wouldn't let you go, no matter what the reason.
Paparazzi are horrible, and I thank god I don't have to deal with something like that every day of my life - but Papparazzi aren't kidnappers, there's no reason to drive recklessly to get away from them. I understand Jenner might have been anxious to get away from them, these past couple of weeks must be intense for him... but it's still his actions that caused the death of the woman in the other car, not the Papparazzi's.