> So by your argument, there's no point in maintaining privacy for either piece of information (DNA / passwords).

The problem with privacy is that it's fragile. When your info is leaked, you should assume it's out there for good.

I also think that while right now when you do the cost/benefit analysis of having your DNA sequenced, you think the cost outweights the benefit. Clearly my personal calculus is different than yours, and that's ok. But I would caution you that in the future that calculation may be different for you.

So I think people will either lose privacy, or voluntarily give up some privacy for some benefit. In either case, we will need something other than privacy to protect ourselves. I think that well-enforced legislation, legislation that limits the way genetic info can be used and gives the individual more control over their own info, is really the only thing that can help.