Why did the CIA spy on the Senate Committee investigating them?
Why?
Because they wanted to know what information the Senate Committee might have that they had not told them.
They wanted to make sure the Committee only had the information that they gave them and nothing more.
They wanted to assure themselves that the really "dirty" stuff had not made its way to the US Senate. After all, lies and obfuscations are their standard operating procedures.
There is little real oversight of these guys.
Not only did they get away with torture, it appears they will also get away with lying to the people that are supposed to be over-seeing them.
No one is held accountable for anything.
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It isn't just the what, but the who. If someone had given the Senate Staffers some good stuff, then the CIA would know what, and who. It is very likely that the staffers would write that Joe Smith had provided information on operation make the bastards scream like a little girl.
This is common in criminal conspiracy. Look at how the Mafia deals with informants, or the Drug Cartels. No I'm not saying the CIA would have killed the informant. However it is probable that the informant would be declared insane and sent to the rubber room and pumped full of thorazine.
If we needed any more evidence that the CIA was home to the most elite criminals, we certainly have it now. But will their budget be cut? Will the offenders be fired? Will they be charged with computer crimes? Nah, at worst the head of the CIA will be fired and a new head will take over and do pretty much the same thing.
If you want to impress me make the senior Civil Rights attorney at the ACLU the head of the CIA and make the president of Amnesty International his deputy. Hell make the spokesman for Wikileaks the public information officer. 