Hmm... maybe. First of all, unfaithfulness is a lot of grays. Maybe we've been together 10 years and 8 years ago she slipped up once, never told me and never did it again. Its possible that the person leaking the info is doing it intentionally trying to ruin an otherwise stable relationship. But that is beside the point.
Here's what the CIA is saying here. Lets go to an extreme. Lets say Hillary was a bad person. A really really bad and dangerous person and Russia felt that they had to protect the US from her from purely altruistic reasons on their end. So they leaked all the stolen wikileak stuff and got trump elected. That's great. Nonetheless, we would need to aggressively investigate Russia for interfering in our election, we need to aggressively investigate their relation to trump, and we need to investigate their motivations for interfering. Because I'm glad its altruistic in my imaginary situation and our investigation would likely find that hey they actually only had good intentions, but in the event it was not altruistic and perhaps actually a scheme to introduce harm, we need to know. In reality even if altruistic, that is a major problem that they interfered.
Lets say you are trying to marry your longstanding girlfriend. And the month before a wedding, mysteriously all sorts of stuff about her past starts leaking out (you get letters in the mail about stuff in the past about her you didn't know, stuff shows up in newspapers, your friends are getting text messages telling them to get you not to marry her, etc) and its clear the aim is intentionally trying to get you not to marry her. That stuff may be bad. It may be really bad and you may decide yeah I don't want to marry this lady because of her checkered past. Nonetheless, when its all said and done, pretty much everyone would wonder who it was that leaked all that stuff and why they wanted to interfere with your marriage. Maybe there are interested in doing more than just breaking up your marriage. You wouldn't want to know? You would simply thank this mysterious person and walk away? If I found out my best friend was trying to secretly break up my marriage even if he thought it was in my best interest to do so, there would still be a major major head on collision between the two of us.
See, like someone stacking up complications attempting to create a work of genius in some Rube Goldberg invention, you've run off on detours with analogies.
First, there are -- or certainly had been in history -- factions within CIA.
Second, there's no refuting the idea that a President-Elect who collaborated with the Russians in simply intending to affect an election outcome is a threat to national security. It's not just some assumption pulled out of the air; it's an axiom.
Third, assume you have evidence of a crime. Assume you were Gil Grissom in "CSI." Better -- assume you were directing a real CSI, as opposed to being a "film director." You can do what some law enforcement is tempted to do when under political pressure: you can develop a convenient theory of the crime based on an easy suspect already arrested, and then cherry-pick the facts for the prosecution's benefit.
Or, you can collect as many facts as you can without prejudice. Suppose you have a database of facts, and someone adds the fact that some butterfly flapped its wings in Indonesia -- the common idea for a religious discussion of Zen? It won't matter, because you can't find an inferential connection between some suspect or other piece of evidence and the butterfly. This is science -- not séance.
With the largest collection of relevant facts, you have the best chance of getting to the truth. That's all there is to it.
Any GOP hack who lives in a bubble of thinking that you can simply design a reality around a political objective and belief system would fail at what either CIA or a CSI could do well.
And nobody -- nobody in that agency -- is going to put forward some concoction that would prove false later, to torpedo even the most toxic, disgusting, low-life trash ever to wait in the wings as a "president-elect."
What comes out of this is much more likely to be a mirror of the Truth and a near-perfect approximation of Absolute Truth -- which as an absolute is rather difficult to achieve from a scientific point of view.
Coming back -- I see that no other posts had come in since this one, so I'll merely update. Someone mentioned "putting out the fire" instead of identifying the cause. Or they insinuated that we shouldn't be laying blame.
You'd lay blame on someone like Dylan Roof and give him 99 years in the electric chair. If this were an industrial quality control or quality assurance program, of course you want to find the "cause" instead of laying blame on someone who merely made a mistake.
But here, the cause is the criminal -- at least certainly in Roof's case, and only possibly that of Trump's case. We're only building a "case," to make better use of the word.
That's why the solution to Roof's "fire" is to either execute Roof, or lock him up --which would be more costly -- so we would hope.