That is the crux of the entire privacy argument. Why strive for privacy when "I have nothing to hide?" Also, how sure are you that having a copy of everyone's DNA data will become widespread? At a minimum, perhaps if you delay making the data easy to extract one can at least hold out hope that privacy laws will catch up. Of course, there's zero guarantee in that happening either.
Lastly, security through obscurity is not something to be relied upon. But it can work for a period of time.
Lastly, security through obscurity is not something to be relied upon. But it can work for a period of time.