They're accidents because the alternative is that they're
purposeful and we have an entirely separate criminal framework for that.
The "expert" cited is a psychologist, not a linguist, and in particular a psychologist who apparently lost his father in such an accident. This is about choosing more emotional language in the hope that somehow this magically fixes a societal problem, which it won't.
When we re-frame this so that we're emphasising blaming the driver, we go back to the era when nothing was improved because well - it's just the driver's fault, so if they're alive we use retributive justice and if not the problem has solved itself. That simply does not work. We need to identify how we can break the chain because these are accidents, there is no intelligent actor purposefully causing them so such interventions can be effective.
Example: Use of road design to slow traffic => Cars and trucks move more slowly, pedestrians are less likely to be struck by traffic and less likely to die if hit. That would do nothing if this was purposeful, if there was intent, but there isn't and so European nations which use narrower roads to slow traffic see significant reductions in deaths and injuries.