Denial of Service Attack
A thought experiment.
Imagine you're an intelligent terrist (Yep, I think they exist) who wants to sow alarm and despondency in heathen lands.
So, you get some friends together and start chatting about a theoretical bomb-cum-laptop that doesn't actually exist. This gets the "intelligence" community all up-tight and nervous, and they put stupid restrictions like this in place.
Result: everyone gets pissed off, the intelligence community loses credibility, and the community in general lose more freedoms.
Mission accomplished!