Re:Cyber 9/11? (Score 1)

* Successfully attack all 13 root name servers simultaneously.
* Middle-east underwater fiber-seeking backhoes from earlier this year immigrate to USA. (If it happens close to home, it's terrorism!)
* Something like the Storm worm starts emailing randomly-named child pornography to everybody (everyone's a criminal).

...to name a few possibilities. That's probably some hypothetical scenario which eludes me which could lead to a legal requirement to have your private encryption keys on file for the government. Inevitably, the database of private keys would be abused and/or stolen.