Facts
Let's face some cold and hard facts of life: it's not the first and unfortunately not the last time that a perfectly sound aircraft is CFIT. Every single time it happened, human error (and frequently criminal), played the most important role. Simple like this, no rocket science.
Every time some poor bastards screw up like this the industry is affected as whole.
It's a stupid, easily avoidable tragedy by simply following rules as old as Aviation itself.
In the event of this investigation reveal (if ever) something diferent I'll humbly offer my face to be slapped.