Though the context of the article isn't necessarily directed are the personal injury arena, the point of the piece is that calling motor vehicle collisions "accidents" is a misnomer that can be damaging in the urban planning (AND personal injury) context. Its a tacit victory for the offender to call all motor vehicle collisions "accidents." The term presumes that the person committing the act had no control over what happened; it implies that nothing could be done about the situation.
I'm an offender myself. "Accident" is shorthand, common parlance to explain the typical car crash situation. The article argues for the word "crash" to be used instead, which is probably a more accurate term anyway. After reading this article, though, I know I'll be more conscious of my terminology going forward.
10/06/2015 addition: Wired magazine recently published an article on the same subject, Stop Calling My Daughter's Death a Car Accident.