> Just out of curiosity, what is it about your relative's blood test that you don't want the NSA to know about?
This is the wrong question. The right question is, "what is it about your relative's blood test that you don't want the NSA, or anybody else in the government, or any contractor or lobbyist the government is persuaded to share this data with, now or at any point in the future, essentially in perpetuity, to know about?"
And the answer is, of course, "I don't know".
I don't know if Obamacare will die an ugly death and insurance companies will successfully lobby for absolutely anything establishing genetic prior conditions.
I don't know if, in 50 years, the government will decide to, say, demonize Jews and go hunting for Ashkenazi DNA indicators in their databases and go after the families they can find with them.
I don't know if a genetic predisposition to homosexuality, haemophaelia, a positive test for AIDs or herpes or ginger hair will one day be used against me or my descendants by some future mob.
And that's why privacy is important.