[rincebrain]

In this particular case, I think the point is less 1 or 2 but more point 3

(3) the contrapositive, where you continued the flight, it really was someone stupid enough to name the broadcast name of a bomb "BOMB", it goes off, and now you have to explain to the press "we thought nobody would be stupid enough to really name it 'BOMB'"

So you assume it's a low risk event, and tell everyone onboard to turn off their devices to remove the chance it's just someone making a bad joke or a coincidence, and then you end up with the outcome of trying to avoid having to say that in a press conference where everyone is already primed to think you didn't do enough.

[jtbayly]

That makes absolutely no sense. As the previous comment pointed out, turning around is not treating it seriously. If you are trying to save face in the extremely unlikely event that it is real, then the only thing you can do is head to the nearest airport.

[CrendKing]

1) If it really was a bomb and went off, the pilot wouldn't be there to explain to the press anyway.

2) How likely would a bomb's name really be "BOMB" vs anything else? If the latter is any higher, wouldn't it be reasonable to always turn around whenever the any other name shows up? In that case, all Bluetooth devices should be strictly banned in the cabin. But TSA is not doing that (not yet).