It's not a matter of privacy. I can't think of much they'd put on the list that I wouldn't be willing to let them have. (The agent acted like I could only possibly be worried that they were going to do genetic testing, but I'd let them do that as long as they, you know, told me, and gave me a copy of the results.) It was just really not okay with me that they wanted it for undisclosed purposes. Lack of privacy and secrets shouldn't be unilateral.