Given the number of people who voluntarily submit DNA to ancestry and other analysis sites, it really doesn't have much practical impact if governments collect it. Even without yours, they have enough of your relatives' to identify you. I have the same knee-jerk reaction as everyone else to government encroaching on privacy, but in the end we've all long since voluntarily given up any semblance of privacy. We're all carrying tracking devices and filling our homes with microphones and our families have given away our DNA for us. Privacy doesn't exist.