Why do airline professionals, whose careers have been most negatively affected by terrorism, strive so hard to accept any cause over even the mere suggestion of foul play? It doesn't compute.
It's pretty simple really. They can't control terrorism but they spend their entire careers learning and practicing how to control technical failures. If it is a technical fault they can assume their hard work and training may give them a chance to bring the aircraft home if it happens to them, if it is terrorism they have just been confronted with the fragility and randomness of life/death. Basically they just want to live.