That the government wanted the public to know that these heinous experiments were taking place, just to try to convince them they didn't work, when it would have been much easier and more effective to simply never reveal them to begin with if they did work.
And if what the MKULTRA documents themselves say don't matter, then all of this is just a matter of faith. What is there to even discuss if the evidence doesn't matter one way or the other? Anything could be a coverup, false flag or misdirection.
I don't necessarily agree with what you're suggesting as being simpler. It may, in fact, be simpler to reveal the experiments and discredit them by using forged documents. Regardless of what may be simpler, I don't think it's scientific to take either position, which is why I prefer an agnostic stance when reading things that essentially require taking a faith-based position.