Captain Rat Catcher.
Accidents do happen no matter how careful people are.
This was a a tragic accident as you say.
The flight was a drop off and empty out,so the Metro would have handled it easily.(Especially this one with it's Dash 10 motors).
The Captain flying the A/C had over a 1000 hrs on this particular machine and was very conciensious in all his planning as well as his IF skills.(I can vouch as I have a good few hours flying with him).
What happened we have no idea.
We may never know what happened.
I have no idea if you have flown in dark Africa,but many times the official let-down plate has the wrong co-ords on it or they have put the wrong town/city ICAO lettering down.
I have also had printing errors on my Jepp.
These things happen.
All I can say,and I am sure many will agree,let us wait until either more info comes to light or the official outcome is published before any of us have too much to say.