Earlier quoted context omitted.
Nope, most successfully stopped attacks are secret. Nobody would even know.
No they're not. If our bloated "national security" apparatus could possibly justify its existence, it would. The reason they keep such justification secret is because it doesn't exist. It has nothing to do with "sources and methods." It has nothing to do with "civil unrest." The reason we can't see the justification is because it doesn't exist.
Here is a small list of the ones that were publicized. https://en.m.wikipedia.org/wiki/List_of_unsuccessful_terrori...