Remember 9/11/2001? We had to found DHS because it was determined no one was doing that one job
Well, we'd need a new agency to do that stuff. And only that stuff. Not assassinations, not propaganda and psy ops, not weird experiments, not run drug and human trafficking rings.
And, also, you know, be less evil.
That was SUPPOSED to be the CIA
And right away, some terrible people saw that as a loophole.
Gather intel, or try to assassinate Castro with an exploding cigar?
Gather intel, or sell drugs in our own inner cities to weaken Black communities and raise untraceable cash for illegal arms deals?
The existence of the CIA makes intelligence sharing within the US and with our allies shakier.