It is such a shame that this guy hanged himself. Guilt can be caused for many reasons and I expect he flew with this Captain a lot before his upgrade and fateful flight to Cork. Now this may be controversial and I am not suggesting this guy did operate poorly but I know I would feel guilty if I had been a CN operating below mins making it seem ok to an FO who then became a CN and crashed operating below mins.
If only this guy had talked about what happened in this company, it would help the investigation and probably himself also.
Such a shame.