No surprises here, of course this is what happens when you create an agency whose mission is to lie, decieve, and break the law, and then give it limited oversight and almost unlimited funding. The CIA's entire history is just one scandal after another.
Of course, a mission like the CIA's does not exactly lend itself to strong oversight. The issues of which you speak, seem like inherent challenges to making effective yet responsible intelligence organizations, rather than just garden variety stupid choices.
At this point from a simple costs vs. benefits standpoint I just do not see how even having a CIA (or at least the Clandestine Service portion) is worth it. They have wasted probably billions of dollars on countless blunders over the decades. They constantly embarrass the State Department by lying to and stealing from our supposed allies, and getting caught doing it. And they get informants killed. Now they're spying on the US's own democratically elected representatives. Meanwhile, what imminent dangers to US security has the Clandestine Service ever prevented? How do they justify their own existence? The Cold War ended decades ago, I don't see how their mission is relevant anymore.