"PARIS — The chief Marseille prosecutor handling the investigation into the crash of a Germanwings jetliner said on Thursday that evidence from the cockpit voice recorder indicated that the co-pilot had deliberately locked the captain out of the cockpit and steered the plane into its fatal descent."

I want to know how in GODs name could the Co-Pilot of Germanwings Airline Crash the Plane?
What would possibly come over someone to do such an act that would Kill 140 innocent lives in such a horrible way?
How is this Possible?
I cannot find an answer to this Question. Can you?

And was he Christian or Jewish? I know he was not of Islamic Religion.