Would terrorists really abstain from forging this out of fear of penalty for purjury? And why would I give up all my anonymity on the Internet just to prevent the NSA from accidentally capturing my traffic?
It's a double satire, actually. The obvious level is the infeasibility, in the good old style of http://tools.ietf.org/html/rfc3514 `Evil Bit'.
At the other, darker and more nefarious level are the proposals of national electronic ID, being put forth every once in a while. A government-issued ID would be the mandated ID for official and semi-official transactions. It's easy to imagine that any communication not signed with such ID would be subject to extra scrutiny, and possibly treated as exempt from legal protections.
