An excellent op-ed from the Open Rights Group: "When ORG defends privacy, we are fighting to protect people from abuses of power that leave them vulnerable."
Yet for many people surveillance makes them less safe: it's not the security blanket politicians are holding it up to be. Job-seekers under surveillance can lose income needed to survive if their online activity fails to match up to job search demands. People interested in campaigning hestiate over getting involved with movements for social justice when the police count activism as akin to domestic terrorism.
It's clear that surveillance affects a broad group of people, with real painful consequences for their lives. We've seen journalists being monitored, lawyers having their client confidentiality broken, victims of police misconduct being spied on and environmental campaigns infiltrated. These people are not criminals, and yet when we have a system of mass surveillance, they become targets for increasingly intrusive powers.
We also know that state surveillance stigmatises certain groups of the population, it targets communities and networks. Innocent people who share similarities with suspects, (similar Skype chat user names, nearby places of worship, physical location) fall under intense scrutiny, like having their private web cam chats examined. Mass surveillance disproportionally affects marginalized groups and fosters mistrust.