Maybe this will work better.
Mr. Smith is driving down a major street and has a continuous right-of-way (no stop lights or signs.) As he approaches an intersection he glances down at the dash to see how much fuel he has. As he crosses through the intersection, He is T-boned by Mr. Jones (a drunk driver who has just run through a stop sign.) Had Mr.Smith not glanced down, he might have seen the car driven By Mr. Jones and avoided the accident. Mr. Jones however, by running the stop sign, was the cause of the accident. Cause and prevention are two different things.
Certainly there were contributing factors to this accident, but who taxied the plane onto the wrong runway? Was it the confusing airport signage? Was it the missing second controller? Maybe it was that big skeleton in the closet of the airport authority that the stewardess (Indy319FA) keeps talking about. Maybe it was someone on the grassy knoll. No. It was the flight crew.
IMHO people don't want to accept that something as simple as checking the heading bug would have prevented this. It has to be more complex than that, especially since it ended so tragically. Well it isn't. One very simple before takeoff item that most people do unconsciously was missed by both crewmembers.