> Your quote does not directly support mass surveillance. It doesn't need to. I wanted to point out that mass surveillance is one of the costs of terrorism, re

> Your quote does not directly support mass surveillance. It doesn't need to. I wanted to point out that mass surveillance is one of the costs of terrorism, regardless of its effectiveness in fighting it. And that we know little about its effectiveness because presumably there is lots of top secret stuff going on. Surely they don't want ISIS to know which channels are compromised and how, which means you can't know too.