I think people are mostly concerned with what they can experience. Building on this, these systems make sure that the breach of privacy is experienced in the least amount possible. When something happens that upsets this surface, like Apple suddenly telling people that an app looked at their clipboard, suddenly privacy is cared about again.

Also, look at other things that are made invisible to the people, and when made visible, people react negatively. Treatment of animals in the various industries, treatment of workers in countries where labour is cheap, issues with waste and its environmental effects.