That’s an excellent point, one I hadn’t considered. Of course any number of accidents happen today to people whose only mistake is not being prescient, or at least not driving sufficiently paranoid to avoid something that arises unexpectedly.
Whilst I imagine it is horrible to be in a car that drives someone over, I don't think the driver deserves the brunt of the sympathy in that situation.
Recognizing that being a witness to a violent death, especially if its your vehicle (despite not being in control), has a significant impact on people takes nothing away from the victim's family.