Why should people sign this?
Look at Korea, without freedom of speech, freedom of criticism on internet, there is some chance that people do stupid things such as dying to save Kim portraits.
There are more and more Vietnamese bloggers detained http://www.rfa.org/english/news/vietnam/delay-08032012155512.html
because of the article 88 of Vietnam's criminal code ("conducting propaganda against the government"). it means that every social network user whose status messages, twits could be reach out by large audience could be in danger by the same article as well.
Message to Mr Mr. Franz Jessen.
I know that it's pleasant to enjoy doing Karaoke in Vietnam, but I think you should stop doing it that for while to speak up for Vietnamese Internet users.
USA embassy in Vietnam has already spoken up http://vietnam.usembassy.gov/pr080112.html, and why haven't you done the same right thing?