Well it's just more proof that mass surveillance doesn't work...to catch terrorists or those willing to commit massacres. If someone wants to go at a subway sta

Well it's just more proof that mass surveillance doesn't work...to catch terrorists or those willing to commit massacres. If someone wants to go at a subway station tomorrow and start stabbing random people or shooting them (especially in US), a surveillance state isn't going to stop that. What does work, however, is being able to use mass surveillance for economic espionage, high-level blackmail, spying and building cases against activists and those wanting to "harm the government" (in a "revealing the truth" kind of way), selective oppression, and so on.