re: Germanwings Crash: One Pilot locked out of cockpit at time of crash

The bus full of kids or vacationers that goes the cliff; the 18 wheeler disaster on the interstate. How do we know a lot of these weren't suicide. No voice recorders in school buses.
The mass shootings...almost all done by psychotics who hadn't exhibited criminal behavior before that time.

It's a lot easier when you can compartmentalize problems to "the enemy." But the world rarely works that way.