The night of the accident, the left runway was closed and lights were turned off.. and they were expecting two runways and to land on the one on the right. There's still no excuse for this happening with two ATP-rated pilots that have done this type of landing thousands of times, but you can kinda see how it is possible at least.
This also isn't unheard-of. For example, Harrison Ford had a similar issue where he landed his private plane on a taxiway at an airport with parallel runways.
Small airports or bad weather at night are a different story - I would not fly into a new airport the first time in those conditions. Think 10x - 100x the risk.
Binoculars might be ok for the non-flying pilot to use, as long as he doesn't drop them on the floor and bind any rudder pedals.
I guess I'm surprised that it took so long for the pilots to see that there were other planes where they were landing.
Is it routine to keep binoculars in a cockpit? Could they have seen what was on the ground sooner if they'd looked through binoculars briefly (after noticing unexpected lights?)