It's called civil bloody liberties. As far as I'm concerned, I want to live in a society with a largely uninterfering state. Bar proving that I'm a real person for polling purposes, I don't particularly want the government, or whoever, to have personal information about me, unless I choose to let them. That's the crux here. Some people don't want their DNA on file, yet you want to force them? Why? In case they might commit a crime in future? And yet you claim this isn't guilt-implying? I'm sorry, but I find the idea of the government forcefully taking my DNA without asking a bit, well, wrong. Don't you?