To a greater extent I see it as a lack of regulation.
Human beings do the best they can with the resources they have at the time - this includes such items as training and culture whether company wise or other
We need to have two well trained professionals in the flight deck (or more if required) for safe operation.
Am surprised nobody has mentioned the monitored approach system which has been proven to be a safe way of operation. Of course both crew members must be proficient and trained for any system to work every time but having used different systems I am convinced (and statistics seem to back this up) that the monitored approach system is sound.
I know from other threads this can be an emotive topic but for those of you who have never flown monitored approaches I ask you to be a little more open minded. I was very sceptical until I practised same and soon became a convert.