I'm with jayteeto....
I am required to do a full day of "Wire Training" each year. We take the course taught by
Utilities Aviation Specialists. I learn something new every year, (and I just did year 6). I also have attended many Human Factors courses---while not an expert by any means, I do believe I am getting a grasp on it.
While they could adjust some of their techniques for spotting the wires, (or more importantly---where the wires "could be, and not see"), they did most things right.
Yes it was a failure of "Human Factors"----I counter with---your eyes will lie to your brain and your brain will believe it..... therefore, not their fault, but the fault of our wiring--and lack of training to recognise the inherent faults in the system, (our bodies).
I will give you an example---be honest.....
Hint--concentrate on just the white shirt players: