Device going boom at security upon power-up could cause a fair deal of carnage too. Except now TSA minions have exposure (pun fully intended) to to this risk (rather than just the aircraft crew and pax).

Not to mention - such an incident would most likely shut down the airport (or at least the terminal) for quite some time. Imagine the chaos that a shutdown of, oh, say LHR T5 could cause.

As someone said earlier-idiots.