I don't suppose anyone believes this woman deliberately knocked down and killed a motorcyclist. It was obviously an accident, although we don't know the exact details. I have sympathy for anyone in this situation.
However, I have more sympathy for the young man's poor parents who, quite rightly in my opinion, want this woman to be treated in the same way as any other driver who has caused a serious injury/fatality. In my opinion, they have behaved perfectly reasonably and are not demanding vengeance but simply that she should have the decency and courage to submit to British law and explain in Court how the accident occurred.
If it were a member of your family Gonegirl, would you be satisfied with an apology and no legal examination of what happened?