[Nate]

1) It's obviously the US if it involves the Dept. of Homeland Security.
2) It feels like a conspiracy theory/practical joke to me.
3) If the government wanted to know what's going on in your computer, they would send you a targetted software keylogger as a virus. It's much more practical and cheaper.
4) There is little point in logging everything typed on every computer sold in the US. The amount of data they would have to trawl through is huge.
5) Speaking of which, the CIA already monitor something like 70% of the email traffic in the world looking for certain keywords (there's a huge satellite array in the Australian desert just for that purpose). It's much more useful to know what people are communicating to each other rather than just what they type on their own computer.
6) It's way too risky an endeavour: so many techies out their would open up their computers and find out what's going on. Surely the government likes their evil schemes a little more secretive?