Now the curious factor is the statement made today by the authorities
"He said Lubitz had never been flagged as a terrorist and would not give details on his religion or ethnic background."
The part about "not being flagged as a terrorist..." create speculation that that is precicesly what the authorities are considering right now. Those facts will certainly be revealed shortly so why the secrecy?
Even AP is fessing up now:
Alone at controls, co-pilot sought to ‘destroy’ the plane:
http://www.whio.com/news/ap/top-news/official-1-pilot-locked-out-of-crash-plane-cockpit/nkfht/