Perhaps they are more frightened at what a cleaned up CIA might discover, should they start looking in the closets.
I have a lot of suspicions that lackadaisical oversight during the Clinton years may have led to quite a few abuses of the CIA's resources, most specifically - unprecedented access by private persons on behalf of some shady non-patriotic industrialists. A similar lack of oversight for abuses in the stock market led to a self-correction in the collapse of the tech bubble. 9/11 was a symptom of a problem, that has resulted in processes that hopefully are self-correcting in their nature, but the process is far from complete and the roaches are fighting against the changes.
Then again, it is about this late that I'm given over to conspiratorial delusions that lay many problems at the door of Bill Clinton's incompetent administration - and his desire to be liked by everybody.