[lodi90]

Seems to be a case of a psycho wanting to go out with a big bang. Columbine shooter type.

[Mouton]

I guess I will have to add that to my other 2 possibilities. I think mechanical problems are ruled out for sure now.

[Cincinatus' Wife]

First picture: Germanwings co-pilot - 28-year-old German Andreas Günter Lubitz (above) - locked his captain out of the cockpit before deliberately crashing into a mountain to 'destroy the plane', it has been revealed

[wideawake]

I think you are correct.