One thought I always have about these kinds of incidents relates to the discussion about the driver leaving the scene. I'm not advocating that leaving the scene should ever be excused, but of all the damage someone could do to me by hitting me with their car, only about 10% of it is leaving the scene. The other 90% is hitting me in the first place.
It's like, in the court of public opinion, if someone hits a cyclist, all is forgiven if they stop and render aid. Nope. You still hit me, and I'm still injured.