Would anyone here be interested in a lawsuit and/or campaign to get this changed?
Having to opt out instead of in is already bad enough.
Not being able to opt out is way beyond "slippery slope".
the antivaxer comment is about opting out for something that is immediately beneficial (disease screening) and long term (research) in lieu of paranoia (in case of a working government) or privacy (in case of a broken government as it is now, according to the article).
the right course of action is not to deny your children of the proven benefits, but to force the government to respect the individual and its own processes/institutions.