It's due to the laws over there. If you hit someone with your car then you have to pay their medical bills. If they die then you don't have to pay anything. This sort of thing is a lot more common than you realise. People just don't care about one another over here (in China).
This really made me cry. I heard the person that tried to help her is getting accused of trying to get media attention as a hero...
My heart goes out to her family. :(
Thanks for the post.