This is my OPINON on SOME hit and runs. And I can imagine what the flamers are going to write already "What if someone hit and run you!!! or your son!!!" Well.....if me or my son ran out into the street like a total idiot.....then I'd be ok with it. Because even if the person stayed I wouldn't hold them responsible for something they weren't at fault for even if the judge decided they should pay me.
But yes, I do agree that it's hard to determine fault in the second after impact....so I don't fully agree with anyone leaving the scene.