I think there are (at least) two failure modes for this kind of agencies: 1- They fail to stop state-level enemies, they fail to predict attacks, they fail to

I think there are (at least) two failure modes for this kind of agencies: 1- They fail to stop state-level enemies, they fail to predict attacks, they fail to assist friendly troops. 2- They break the laws of their own country, commit torture, treason or what can be considered crimes against humanity in the pursuit of their mission. What we are seeing belongs in the second category. Whether it's also the first is harder to assess (though like others have mentioned, their historical track record is less than stellar).