That's true, but if you have full control over who can see your information (i.e. "I allow it to be anonymized and used for genetics/cancer research in exchange for information about myself, for myself"), it's not a problem. I just get frustrated when the will of the vocal few override the welfare of the silent majority.
You really didn't understand the GP I believe. The 'silent majority' are the people who would suffer from this, they won't benefit. A select few will profit (vastly) from being able to sell insurance to those who don't need it and withhold it from those that do.
You having control over your information is a pipe dream, try facebook for starters and now think 'all my medical information, past, present and future' instead of your friends graph.
Privacy advocates tend to be a bit more educated about these risks than the general public and maybe know a thing or two about what has already transpired.
And for the record, you can't anonymize a genome, it is you.
