It's an election year.
While Feinstein's own seat isn't up in November, how she responds to abuses by the intelligence community will have an effect on whether the Dems retain their senate majority and perhaps gain a house majority.
As Chair of the Senate Intelligence Committee, she is the key figure in intelligence oversight, yet it is obvious to anyone paying attention that she has failed in her duty to protect the Constitution. As a politician, she has no recourse now but to blame the subjects of her oversight.
Because Congress has failed so pathetically and dismally to take their oversight role seriously, and has completely ignored the public interest, and because the public is now slightly more awake and know this, politicians will be scrambling to absolve themselves of their failure and blame everything on the intel community directly.
That being said, the intel community have done their level best to skirt and undermine every manner of public oversight, but that doesn't justify Congress' continual use of a slack leash.
Though it is sad that it took such a massive whistleblowing event for the public to pay attention and for the politicians to make even an obviously disingenuous gesture of caring about oversight, there is some slight hope that Feinstein's latest feigned indignation is a sign of a turning political tide, towards tightening the leash and putting some sort of meaningful limit on secret unaccountable power.
For this chance at fixing our democracy, we owe Mr. Snowden our thanks.
The next step is up to the public themselves, since, in the absence of public vigilance, our elected officials will go back to rubber-stamping every form of war and torture and spying desired by the Executive branch.