Out of interest on a normal configured approach N1 is at plus or minus 50% for the approach - to be at flight idle from 1950ft on GP I would have expected the ac to stall much earlier unless the aircaft was high energy. If that were the case they may well have needed to be at idle to reduce to bug speed but stabilised criteria require engines to be spooled up at 500ft so it should still have been picked up.
Yes I agree as flight crew we are paid to do it right, however, we will never overcome the human factors element; their integration into the operation is as vital to a safe operation as design and SOPs. The repetative nature of our job can often lull us into a false sense of security as 99% of the time things work as advertised. The other 1% is when most accidents happen ie when something non-normal has been introduced into the equation. No pilot deliberately stalls their aircaft into the ground - to have 3 experience aviators do it is difficult to understand but rest assured there will be many other factors combined which culminated in this tragedy.