I guess you can't read. The issue is unintended consequences. From the link you didn't read...
Julian Assange agreed with Jacob Appelbaum and stated that "Mass surveillance is a mass structural change. When society goes bad, it's going to take you with it, even if you are the blandest person on earth."
Ignacio Cofone, a law professor, argued that whenever people disclose relevant information to others, they also disclose irrelevant information. This irrelevant information has privacy costs and can lead to other harms, such as discrimination.
The follow on effects of mass surveillance are the issue. It turns into a social credit system over time. If you know you are being watched you'll change your behavior, which goes against freedoms we think we enjoy. Doesn't matter if that watching is all public or not.