>the four-star general presented a timeline of terrorist attacks around the world, from the 1993 World Trade Center bombing to the Boston Marathon attack . Can anyone speak as to why, with the NSA's systems, they were not able to thwart an attack by the ass clowns in Boston? Russia even warned us about them and they made frequent contact with foreigners. I'm sorry, but that terrorist event seems like low hanging frui…
Domestic terrorism is domestic and therefore under the FBI's purview. And despite what Snowden seems to think about mind-reading programs, unless either brother put out on the public Internet or phone communications what they were planning to do, there would have been no way for NSA to pre-emptively detect it even if they were warrantlessly monitoring all domestic communications.
So in a way your question is equivalent to asking why ASLR didn't stop that CSRF attack on the web page you just viewed.