Hi!
"You are a professional airline pilot and... apparently don't look at or read airport signs and markings...."
Another example of how this was complicated. They WERE in the correct physical location to take off on the correct runway. The runways connected in a "V" shape, and they were in the takeoff position for BOTH runways. Also, they could not follow their Jepps airport diagrams to taxi to the runway...the diagrams were wrong, as they had not been updated properly due to the construction.
Pilots ARE human, and it is VERY EASY for us to make an error. Both pilots checking their DGs vs. the runway heading is a very good idea. My last US airline just added it to their Before Takeoff Checklist-Final Items per POI request.
cliff
GRB