I've got a guess as to what the author is talking about, because gun owners have a similar thing. In the case of guns, it's "there's no such thing as an accidental discharge, only a negligent one".

By this reading, the author is probably saying that unless your car malfunctions and prevents you from stopping or steering, or there is some equivalent fluke happening (a deer darts out in front of you and you physically can't stop in time), then "accidents" are caused by negligence (not checking lanes when changing, playing with the radio, not looking for pedestrians) or malfeasance (unsafe passing, driving at an unsafe speed for the conditions, drunk driving).

I have mixed feelings about this, but I've been driving a while and I've seen a lot of truly stupid and/or mean spirited and/or reckless behavior that could quite predictably result in a collision, but it'd be a stretch to call the sad and obvious outcome an 'accident'.