Maybe Because They do not Want to be Revealed as Sociopathic Sadists?

This would explain why the CIA has consistently lied about both the effectiveness and the extent of its torture program:

A report by the Senate Intelligence Committee concludes that the CIA misled the government and the public about aspects of its brutal interrogation program for years — concealing details about the severity of its methods, overstating the significance of plots and prisoners, and taking credit for critical pieces of intelligence that detainees had in fact surrendered before they were subjected to harsh techniques.

The report, built around detailed chronologies of dozens of CIA detainees, documents a long-standing pattern of unsubstantiated claims as agency officials sought permission to use — and later tried to defend — excruciating interrogation methods that yielded little, if any, significant intelligence, according to U.S. officials who have reviewed the document.

“The CIA described [its program] repeatedly both to the Department of Justice and eventually to Congress as getting unique, otherwise unobtainable intelligence that helped disrupt terrorist plots and save thousands of lives,” said one U.S. official briefed on the report. “Was that actually true? The answer is no.”

Current and former U.S. officials who described the report spoke on the condition of anonymity because of the sensitivity of the issue and because the document remains classified. The 6,300-page report includes what officials described as damning new disclosures about a sprawling network of secret detention facilities, or “black sites,” that was dismantled by President Obama in 2009.

Classified files reviewed by committee investigators reveal internal divisions over the interrogation program, officials said, including one case in which CIA employees left the agency’s secret prison in Thailand after becoming disturbed by the brutal measures being employed there. The report also cites cases in which officials at CIA headquarters demanded the continued use of harsh interrogation techniques even after analysts were convinced that prisoners had no more information to give.

(emphasis mine)

Also, the techniques used were far worse than previously revealed.

We now understand why the CIA has bee pushing back against the Senate Intelligence Committee. 

It's one thing to argue that it was a necessary evil that yielded results, it's another that the policies were prosecuted out of nothing more than a sadistic need to prove how macho they are.

Truth be told, I am not surprised.  This sort of narcissistic cruelty is something that I would expect to have originated from the mind of one Richard Bruce Cheney.

The problem is that for the entire Bush-Cheney years, being a sadistic torturer, or at least pretending to be one, was the only way for advancement in the CIA, and Obama has done nothing to clean house since then.

This means that the upper echelons of the CIA need to cover up this at all cost, or they will be sidelined.

Torture comes home, nu?