I don't see a problem showing a device is working as intended. If it can prevent even one bomb from going on a plane it's well worth it.
I don't see why people are getting bent out of shape about this. Take a chill pill people.
Dunno why I'm responding to a subhuman troll, but hey it's Monday, so:
First of all, it won't prevent any bombs from being brought onboard. How difficult do you think it is to show a working laptop which happens to have 500g of C4 wedged inside?
Second, it's an absurd abuse of reality, since as everyone and his brother already said, any device w/ dead battery -- or heaven forbid, some toy that only runs on AC and you didn't bring the adapter-- gets tagged as "dangerous terrorist thingie."
Third, it'll be cheaper to pay $10 million per person injured, let alone killed, by your fictional device-bomb than the direct and indirect cost of this screening program.
Finally, it'll take approximately negative 5 seconds for any potential bomber (of which there aren't any in the first place) to use some other gizmo to carry a bomb. Like a fake tin of sardines. Ooops, apologies to everyone who was going to bring a snack on board.