All this talk of ATC/TU154 procedures/PAR etc etc is a waste of time. It appears that the CVR is not complete OR something very strange was happening in the cockpit - why else is there no apparent discussion/comment/acknowledgement from PF following P2's go-round call to just before impact?
To bring this down to basics. I can, at the moment, think of 5 reasons why I would fly below DH:
1) I am convinced I have sufficient visual acquisition
Without a 'visual'
2) Due to lack of fuel or technical problems, this approach is the only one I can make for a landing
3) Someone has a gun at my head (even then, why kill everybody else?)
4) My instruments are malfunctioning
5) I am incompetent