The real human-factors issue that needs to be taken apart bit by bit is the inaction of this apparently competent F/O as well as his apparently competent fellow F/O at Islamabad.
Both of them should have seized control of their respective airplanes before it was too late. But, apparently both of them were so brow-beaten they entered a state of disbelief about what the old man was (or was not) doing.
That is truly the sad aspect of both accidents.