Since I was not there I am not "sure" of anything at all. However the facts that have been presented so far are two approaches below minimums followed by a fatal third. The aircraft appears to have been serviceable until impact. Sadly the lessons to learn here seem to point on the Human Factors direction.
If you have factual information to the contrary please share it.
Even if an engine failed (of which there is no evidence) it should have been manageable. An engine failure at minimums is a handful, at 30 feet in IMC a complete disaster. Surely the point here is that busting the minima repeatedly they did stack the odds against themselves should anything at all go wrong.