If the CIA isn't allowed to do certain things for spying, so ... just have Israel spy on our populace and since we basically fund them and let them spy on us anyway, just make sure their database is open to us?
Where else is there 1) the talent and 2) the relative degree of trust?
There are a lot of stories from my childhood (of debatable ranking on the conspiracy scale) of the dirty pool and awful unconstitutional behavior by the CIA and other agencies.
It is my vague impression that the increased information awareness from the web tempered the bad behavior for a couple decades, but I think the old habits will start reappearing in "cyberspace" once they gain sufficient deniability, and people's live reach a level of "mortal" dependence on it.