So now we have a single node from which all electronic forms of human communication can be read, listened to and analyzed. The decisions of any and all businessmen in the running of their financial empires, the conversations of all persons as they speak to their stockbroker, their mistress or their business colleague. And I am told to believe that this situation is OK, is normal, and that nothing untoward will be done with all of this information.
Yet I know that if I had access to this information I could make billions of dollars (e.g., by shorting stocks or by buying businesses or commodities), alter the lives of people who I do not like (e.g., get them fired for their hidden or unhidden human weaknesses), destroy entire organizations by revealing the contents of their communications to a selective person or persons. The list of possibilities is almost infinite and I cannot, do not, will not believe that such actions not only are possible, but have already happened and indeed are happening at this very moment.
The Roman Terence said: "Homo sum, humani nihil a me alienum puto", that is "I am a human being, I consider nothing that is human alien to me."
PRISM must be dismantled, it's backup volumes destroyed, it's creators punished. But we will never likely be able to put it back into Pandora's box: there will always be someone who saves a hard drive or a backup tape cartridge and who will sell it to the highest bidder. We will have to declare new laws rendering these acts illegal. We will have to hunt illegal data gatherers down and punish them the old-fashioned way using humans, knives, blood, sweat and tears.