Let me ask you this: What if this report came out and said the exact opposite? What would your reaction be if the interrogation techniques were in no way overly brutal, if everything was done to the books, and the information collected saved millions of lives.

I'm going to take a guess and say you'd be very skeptical of the contents. Maybe you'd go so far as to say everything about the document was a lie perpetrated by the Republican party and other supporters of "advanced interrogation techniques".

This is just a prime example of confirmation bias [0]. If a report comes out saying torture has worked, you dismiss it. If a report comes out saying the opposite, you hail it as the only evidence that even matters (obviously I'm exaggerating a bit to make my point, but I'm sure you get the idea).

A very strongly-sided report just became declassified with little insight into any biases that its writers may have. I highly doubt anyone in the government lacks the integrity to put out a completely fake report of this caliber, but everyone should be looking at this with at least a little cynicism.

[0] https://en.wikipedia.org/wiki/Confirmation_bias