>I think trusting in our system of checks and balancees
No. A thousand times no. No damn way.
Don't trust, observe, verify. That is the /whole/ point of it. Like really, all of it. Compromising that system is the first hurdle of any person or group seeking more unchecked power. Don't trust, verify.
Without commenting on mk-ultra or any other specific thing. You assess the source. In so far as possible you assess the motives. You see who gains and loses by the release of the info and so on.
CIA says russia blew up its own pipeline. Gonna have to see some pretty good evidence of that to overcome the obvious necessary scepticism. Leaked cia doc says no russia did not. Already more plausible without knowing /anything/ else about it and I am expressing no view here about that incident or the existence of otherwise of documents. Yep both could be completely false. So you move on to corroborating evidence, multiple sources etc.
Moreover citing "the same people" without sourcing is weak as water. There are as many views as there are people to hold them. Inside the cia they will not be of one mind in their thinking.