Earlier quoted context omitted.
I think this is an important point to make. I think most people, myself included, are fine with sharing personal information if the person i'm sharing it with isn't going to use it against me. That's always been the case dealing with people.
I think that it is clear than then you post on Facebook about my/your/someone's cancer treatment, data aggregators will mark this in your medical records. An insurer 20-30 years from now will easily correlate that my/you/someone's kid has me/you/etc as a father, and therefore have increased chances of cancer (or some other disease) and thus affect their chance to get life insurance or affect the price of premiums. Wh…
So the real issue is can't get insurance/too expensive insurance, not the privacy itself.
If this is fixed then I don't care if the information being public.