I’ll rule out ‘gay’ just for starters.
That leaves “muslim, etc.”
The ‘etc’ part could be anything from psychotic to sociopath.
Both kinda rare types.
That just leaves the ‘muslim’ part................
Next is the criminal investigation (which is probably already in progress).
Wonder if he had a roommate at his flat in Dusseldorf?
That just leaves the ‘muslim’ part................
Not sure about that. Info is slowly dribbling out on the suspected perp. Unexplained 6 month break in his flight training for one.
It’s possible the airline knew he was a flake and still promoted him. This guy would be flying small regional airline puddle jumpers in the US. Foreign airlines give these young pilots way to much responsibility on mainline aircraft.