Good point. The cables only provide evidence that the US government captured and tortured this one particular innocent guy in Europe using their network of black sites, European prisons, and secret prisoner transportation networks. There's a ton of circumstantial evidence that they in fact used this infrastructure to kidnap and torture a whole bunch of other innocent people, but the current batch of cables doesn't prove that by itself.
I highly recommend Jane Mayer's book The Dark Side for putting together all the public information we have on the black sites and the prisoner transport network though: http://www.amazon.com/Dark-Side-Inside-Terror-American/dp/03...