It tries to prevent terrorism before it happens. I don't expect it to give us a detailed breakdown of its activities toward this end. What I expect is for there

It tries to prevent terrorism before it happens. I don't expect it to give us a detailed breakdown of its activities toward this end. What I expect is for there to be good checks and balances along with consequences for the bad actors when abuses happen. They have not done a great job on those fronts, but the agencies existence and mission is not a problem by itself.