Perhaps the key is that most people do not perceive huge benefits from these, but they perceive huge danger from the downsides. People usually both underestimat

Perhaps the key is that most people do not perceive huge benefits from these, but they perceive huge danger from the downsides. People usually both underestimate their own downstream benefits because of large inferential distance between the thing (encryption) and themselves, and overestimate the dangers of the downsides. Then we'd have the ages-old dynamic that something that benefits everyone a bit but harms a minority a lot will be pushed out by people.