Because she's the sort of person to knowingly knock a person off /over in a motor vehicle, drive off with out checking, then brag about. She could have killed the guy and didn't have the decency to admit fault and check the state of the person she hit, then to brag about it.
I hope she gets made an example off, she showed a lack of humanity when she drove off, so why should she have any compassion spared on her
Oh I agree she should be punished wholeheartedly mate. However people sticking their oar in and saying this and that is not helpful.