Mass surveillance was created to work against minorities: https://en.wikipedia.org/wiki/McCarthyism http://www.theguardian.com/environment/2013/feb/14/canada-en... https://overland.org.au/2014/07/surveillance-of-activists-is... https://www.eff.org/deeplinks/2014/11/fbis-suicide-letter-dr...
Mass surveillance is meant to work against anybody and everybody
If your opinion is already popular, you don't have to be brave: you know it's out there.
If your opinion is unpopular, knowing someone's watching may silence it altogether.